@article{SteinertRudertSieker2014,
  author    = {Steinert, Andre F. and Rudert, Maximilian and Sieker, Jakob T.},
  title     = {"Symptomatic loosening of a total knee arthroplasty caused by a tibial chondrosarcoma - a case report"},
  doi       = {10.1186/2193-1801-3-308},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-110341},
  year      = {2014},
  abstract  = {Premature implant loosening following total knee arthroplasty (TKA) can have several causes. In this article we report on a rare case of a 74 year old male patient suffering tibial component loosening 14 month after primary TKA. The patient did neither have any malignancies nor joint arthroplasty before. Upon clinical examination the range of motion in the diseased knee was painfully restricted to 80° of knee flexion, with the patient increasingly suffering sleeping and resting pain, and also at weight bearing. In standard radiographs, loosening of the TKA due to a large osteolysis at the tibial component was evident. Local computed tomography (CT) of the right knee revealed loosening of the tibial component due to a presumably malign bone tumor. For determination of the final diagnosis a representative biopsy of the tumor was taken by open surgery prior to the tumor resection. Histopathologic evaluation of the biopsy revealed a periprosthetic myxoid chondrosarcoma of the proximal tibia. Pre-operative staging examination included CT scans of lung and abdomen, as well as a bone scintigraphy which revealed no signs of tumor metastasis in the body. Surgical management comprised wide tumor resection and implantation of a hinged tumor knee arthroplasty with replacements of the distal femur and proximal tibia, as well as a patella tendon replacement using a synthetic ligament. Revision surgery was necessary twice due to impaired wound healing and critical soft tissue coverage, and treatment included a gastrocnemius muscle flap with skin mesh graft covering. Unfortunately long-term follow-up examinations could not be obtained, as the patient deceased due to an alveolitis during rehabilitation. In summary, the specifics of this rare case of aseptic TKA loosening, and the unusual circumstances of chondrosarcoma diagnosis and treatment are informative for those providing surgical treatment of similar cases.},
  language  = {en}
}
@article{KlotzMentrupRegensburgeretal.2012,
  author    = {Klotz, Barbara and Mentrup, Birgit and Regensburger, Martina and Zeck, Sabine and Schneidereit, Jutta and Schupp, Nicole and Linden, Christian and Merz, Cornelia and Ebert, Regina and Jakob, Franz},
  title     = {1,25-Dihydroxyvitamin D3 Treatment Delays Cellular Aging in Human Mesenchymal Stem Cells while Maintaining Their Multipotent Capacity},
  series = {PLoS ONE},
  volume    = {7},
  journal   = {PLoS ONE},
  number    = {1},
  doi       = {10.1371/journal.pone.0029959},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-133392},
  pages     = {e29959},
  year      = {2012},
  abstract  = {1,25-dihydroxyvitamin D3 (1,25D3) was reported to induce premature organismal aging in fibroblast growth factor-23 (Fgf23) and klotho deficient mice, which is of main interest as 1,25D3 supplementation of its precursor cholecalciferol is used in basic osteoporosis treatment. We wanted to know if 1,25D3 is able to modulate aging processes on a cellular level in human mesenchymal stem cells (hMSC). Effects of 100 nM 1,25D3 on hMSC were analyzed by cell proliferation and apoptosis assay, beta-galactosidase staining, VDR and surface marker immunocytochemistry, RT-PCR of 1,25D3-responsive, quiescence-and replicative senescence-associated genes. 1,25D3 treatment significantly inhibited hMSC proliferation and apoptosis after 72 h and delayed the development of replicative senescence in long-term cultures according to beta-galactosidase staining and P16 expression. Cell morphology changed from a fibroblast like appearance to broad and rounded shapes. Long term treatment did not induce lineage commitment in terms of osteogenic pathways but maintained their clonogenic capacity, their surface marker characteristics (expression of CD73, CD90, CD105) and their multipotency to develop towards the chondrogenic, adipogenic and osteogenic pathways. In conclusion, 1,25D3 delays replicative senescence in primary hMSC while the pro-aging effects seen in mouse models might mainly be due to elevated systemic phosphate levels, which propagate organismal aging.},
  language  = {en}
}
@phdthesis{Braag2022,
  author    = {Braag, Aaron},
  title     = {10 Jahres Ergebnisse nach muskelschonendem modifiziertem Watson Jones Zugang bei der Implantation von H{\"u}fttotalendoprothesen},
  doi       = {10.25972/OPUS-28141},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-281416},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2022},
  abstract  = {Bei der Implantation von H{\"u}fttotalendoprothesen (HTEP) finden seit etwa 15 Jahren minimalinvasive muskelschonende Zug{\"a}nge zunehmend Verwendung. Langfristige Daten der Zug{\"a}nge, insbesondere des minimalinvasiven anterolateralen Zuganges nach Watson-Jones (ALMI) sind in der Literatur bisher nur unzureichend vorhanden. Methodik: Ziel dieser Studie war es ein Kollektiv nach HTEP Implantation mit ALMI Zugang mit einem Kollektiv nach HTEP Implantation mit lateralem Zugang nach 10 Jahren hinsichtlich Gelenksfunktion, Muskelfunktion, Zufriedenheit und radiologischer Parameter zu vergleichen und etwaige Unterschiede in der Langzeitbilanz zu detektieren. Zwei Kollektive mit jeweils 29 operierten H{\"u}ftgelenken, Erstimplantation durch die gleichen Operateure in den Jahren 2005 bis 2008, wurden im Diakoniewerk M{\"u}nchen-Maxvorstadt nachuntersucht. Die daf{\"u}r herangezogenen Parameter waren Harris Hip Score, Forgotten Joint Score-12, klinische Pr{\"u}fung des Trendelenburg Zeichens, postoperative R{\"o}ntgenbildgebung, Auftreten von Komplikationen und Narbenl{\"a}nge. Ergebnisse \& Schlussfolgerungen: Die beiden Kollektive zeigten in den Parametern Harris Hip Score, Forgotten Joint Score und klinische Pr{\"u}fung des Trendelenburg Zeichens geringf{\"u}gige Unterschiede zugunsten des ALMI Kollektivs, die jedoch nicht signifikant waren. Beide Kollektive erreichten in den beschriebenen Scores sehr gute bis exzellente Ergebnisse nach 10 Jahren. Das geringere Auftreten eines auff{\"a}lligen Trendelenburg Zeichens im ALMI Kollektiv (13,8 vs. 6,9 \%) gibt Hinweise auf eine verbesserte Funktion der Glutealmuskulatur durch die intraoperative Muskelschonung. Die beiden Zug{\"a}nge zeigten in den radiologischen Parametern und der Komplikationsrate ebenb{\"u}rtige Ergebnisse. Vermehrte Fehlpositionierungen wurden im ALMI Kollektiv nicht beobachtet. Unsere Beobachtungen passen zu den wenigen vorhandenen in der Literatur beschriebenen Ergebnissen von minimalinvasiven muskelschonenden Zug{\"a}ngen in der Langzeitbilanz.},
  subject      = {Minimalinvasiv},
  language  = {de}
}
@phdthesis{Bockholt2008,
  author    = {Bockholt, Martin},
  title     = {9-11 Jahres Ergebnisse nach zementierter Titanschaft-Prothese (M{\"u}ller-Geradschaftprothese)},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-37635},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2008},
  abstract  = {In den letzten Jahrzehnten ist die Anzahl der degenerativen Gelenkerkrankungen wie die Coxarthrose und somit die Zahl der zu implantierenden H{\"u}fttotalendoprothesen stark gestiegen. Ziel der vorliegenden Arbeit ist es, langfristige Ergebnisse zementierter Titanschaftprothesen in Bezug auf aseptische Lockerungen zu ermitteln. Von den in der Orthop{\"a}dischen Universit{\"a}tsklinik W{\"u}rzburg implantierten H{\"u}fttotalendoprothesen von Januar 1990 bis M{\"a}rz 1992 konnten nach durchschnittlich 9 Jahren 110 H{\"u}fttotalendoprothesen klinisch und radiologisch nachuntersucht werden. Zum Zeitpunkt der Kontrolluntersuchung hatten die Patienten ein mittleres Alter von 76 Jahren. In allen F{\"a}llen wurden M{\"u}ller-Geradschaftprothesen mit einer Ti-6A1-7Nb-Legierung in matter Oberfl{\"a}che, Biolox®-Keramik-K{\"o}pfe sowie Knochenzement Palacos-® verwendet. Es wurde bei 4 H{\"u}ft-TEPs wegen aseptischer Lockerung ein Prothesenwechsel durchgef{\"u}hrt. Das nachuntersuchte Patientengut wurde in 3 Gruppen eingeteilt. Gruppe A rekrutierte sich aus denjenigen Patienten, bei denen keine radiologischen Lockerungszeichen erkennbar waren. Die Patienten mit mehr als einem Lysesaum jedoch mit festem Sitz der Schaftprothese im Vergleich zu den postoperativen R{\"o}ntgenbildern wurden der Gruppe B zugeordnet. Letztendlich bildeten die Patienten mit ausgepr{\"a}gten Lockerungszeichen bzw. vollst{\"a}ndig gelockerte Prothesen die Gruppe C. Der Harris-Hip-Score der Gruppe A mit 85 (\&\#61617; 13) Punkten und der Gruppe B mit 86 (\&\#61617; 14) Punkten zeigte gute Ergebnisse. Der Harris-Score lag in der Gruppe C bei 76 (± 5) Punkten und erreichte somit ein m{\"a}ßiges Ergebnis. Im Vergleich zu den Gruppen A und B erwies sich diese Punktezahl als signifikant schlechter. Die Patienten mit ausgepr{\"a}gten Lockerungszeichen waren signifikant j{\"u}nger (im Mittel 6 Jahre) als die der Gruppe ohne Lockerungss{\"a}ume. Ebenfalls fanden wir einen signifikanten Unterschied im Bezug auf das K{\"o}rpergewicht, K{\"o}rpergewicht im Verh{\"a}ltnis zu zementierter Schaftoberfl{\"a}che und Harris-Score (88 vs. 75 kg; 1,5 vs. 1,0 kg/cm; 76 vs. 85). F{\"u}r Geschlecht, Schaftgr{\"o}ße, Schaftart, Aktivit{\"a}t, heterotope Ossifikationen und Body-Maß-Index traf dies nicht zu. Unter Ber{\"u}cksichtigung der erhobenen Daten (Harris-H{\"u}ft-Score und Quotient des K{\"o}rpergewichts zur zementierten Schaftoberfl{\"a}che) sollte eine m{\"o}glichst große Prothese implantiert werden, um das K{\"o}rpergewicht auf eine große Schaftoberfl{\"a}che zu verteilen. Insgesamt hat sich die zementierte M{\"u}ller-Geradschaftprothese aus Titanlegierung bew{\"a}hrt, so dass sie f{\"u}r die Behandlung von Nickelallergiker zu empfehlen ist.},
  subject      = {Aseptische Lockerung},
  language  = {de}
}
@article{ReichertvonRottkayRothetal.2018,
  author    = {Reichert, Johannes C. and von Rottkay, Eberhard and Roth, Franz and Renz, Tim and Hausmann, Johannes and Kranz, Julius and Rackwitz, Lars and N{\"o}th, Ulrich and Rudert, Maximilian},
  title     = {A prospective randomized comparison of the minimally invasive direct anterior and the transgluteal approach for primary total hip arthroplasty},
  series = {BMC Musculoskeletal Disorders},
  volume    = {19},
  journal   = {BMC Musculoskeletal Disorders},
  number    = {241},
  doi       = {10.1186/s12891-018-2133-4},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-176072},
  year      = {2018},
  abstract  = {Background: The presented prospective randomized controlled single-centre study compares the clinical outcome up to 12 months after total hip arthroplasty using a minimally invasive single-incision direct anterior (DAA) and a direct transgluteal lateral approach. Methods: A total of 123 arthroplasties were evaluated utilizing the Harris Hip Score (HHS), the extra short musculoskeletal functional assessment questionnaire (XSFMA), the Short Form 36 (SF-36) health survey, a Stepwatch™ Activity Monitor (SAM), and a timed 25 m foot walk (T25-FW). Postoperative x-ray images after THA were reviewed to determine inclination and stem positioning. Results: At final follow-up, the XSFMA functional index scores were 10.3 (anterior) and 15.08 (lateral) while the bother index summed up to a score of 15.8 (anterior) and 21.66 (lateral) respectively, thus only differing significantly for the functional index (p = 0.040 and p = 0.056). The SF-36 physical component score (PCS) was 47.49 (anterior) and 42.91 (lateral) while the mental component score (MCS) summed up to 55.0 (anterior) and 56.23 (lateral) with a significant difference evident for the PCS (p = 0.017; p = 0.714). Patients undergoing THA through a DAA undertook a mean of 6402 cycles per day while those who had undergone THA through a transgluteal approach undertook a mean of 5340 cycles per day (p = 0.012). Furthermore, the obtained outcome for the T25-FW with 18.4 s (anterior) and 19.75 s (lateral) and the maximum walking distance (5932 m and 5125 m) differed significantly (p = 0.046 and p = 0.045). The average HHS showed no significant difference equaling 92.4 points in the anterior group and 91.43 in the lateral group (p = 0.477). The radiographic analysis revealed an average cup inclination of 38.6° (anterior) and 40.28° (lateral) without signs of migration. Conclusion: In summary, our outcomes show that after 1 year THA through the direct anterior approach results in a higher patient activity compared to THA utilizing a transgluteal lateral approach while no differences regarding hip function are evident.},
  language  = {en}
}
@article{SeefriedMuellerDeubertSchwarzetal.2010,
  author    = {Seefried, Lothar and Mueller-Deubert, Sigrid and Schwarz, Thomas and Lind, Thomas and Mentrup, Birgit and Kober, Melanie and Docheva, Denitsa and Liedert, Astrid and Kassem, Moustapha and Ignatius, Anita and Schieker, Matthias and Claes, Lutz and Wilke, Winfried and Jakob, Franz and Ebert, Regina},
  title     = {A small scale cell culture system to analyze mechanobiology using reporter gene constructs and polyurethane dishes},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-68099},
  year      = {2010},
  abstract  = {Mechanical forces are translated into biochemical signals and contribute to cell differentiation and phenotype maintenance. Mesenchymal stem cells and their tissuespecific offspring, as osteoblasts and chondrocytes, cells of cardiovascular tissues and lung cells are sensitive to mechanical loading but molecules and mechanisms involved have to be unraveled. It is well established that cellular mechanotransduction is mediated e.g. by activation of the transcription factor SP1 and by kinase signaling cascades resulting in the activation of the AP1 complex. To investigate cellular mechanisms involved in mechanotransduction and to analyze substances, which modulate cellular mechanosensitivity reporter gene constructs, which can be transfected into cells of interest might be helpful. Suitable small-scale bioreactor systems and mechanosensitive reporter gene constructs are lacking. To analyze the molecular mechanisms of mechanotransduction and its crosstalk with biochemically induced signal transduction, AP1 and SP1 luciferase reporter gene constructs were cloned and transfected into various cell lines and primary cells. A newly developed bioreactor and small-scale 24-well polyurethane dishes were used to apply cyclic stretching to the transfected cells. 1 Hz cyclic stretching for 30 min in this system resulted in a significant stimulation of AP1 and SP1 mediated luciferase activity compared to unstimulated cells. In summary we describe a small-scale cell culture/bioreactor system capable of analyzing subcellular crosstalk mechanisms in mechanotransduction, mechanosensitivity of primary cells and of screening the activity of putative mechanosensitizers as new targets, e.g. for the treatment of bone loss caused by both disuse and signal transduction related alterations of mechanotransduction.},
  subject      = {Bioreaktor},
  language  = {en}
}
@article{NedopilDhaliwalHowelletal.2022,
  author    = {Nedopil, Alexander J. and Dhaliwal, Anand and Howell, Stephen M. and Hull, Maury L.},
  title     = {A surgeon that switched to unrestricted kinematic alignment with manual instruments has a short learning curve and comparable resection accuracy and outcomes to those of an experienced surgeon},
  series = {Journal of Personalized Medicine},
  volume    = {12},
  journal   = {Journal of Personalized Medicine},
  number    = {7},
  issn      = {2075-4426},
  doi       = {10.3390/jpm12071152},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-281842},
  year      = {2022},
  abstract  = {After starting an orthopedic practice, a surgeon with a fellowship in mechanically aligned (MA) TKA initiated this study to characterize their learning curve after they switched to unrestricted kinematic alignment (KA) TKA using manual instruments. Accordingly, the present study determined for the inexperienced (IE) surgeon the number of cases required to achieve consistent femoral resections and operating times, and whether the femoral resection accuracy, patient-reported outcome measures (PROMs), and component alignment were different from an experienced (E) surgeon. This prospective cohort study analyzed the IE surgeon's first 30 TKAs, all performed with KA, and 30 consecutive KA TKAs performed by an E surgeon. The resection accuracy or deviation was the calipered thickness of the distal and posterior medial and lateral femoral resections minus the planned resection thickness, which was the thickness of the corresponding condyle of the femoral component, minus 2 mm for cartilage wear, and 1 mm for the kerf of the blade. Independent observers recorded the femoral resection thickness, operative times, PROMs, and alignment. For each femoral resection, the deviation between three groups of patients containing ten consecutive KA TKAs, was either insignificant (p = 0.695 to 1.000) or within the 0.5 mm resolution of the caliper, which indicated no learning curve. More than three groups were needed to determine the learning curve for the operative time; however, the IE surgeon's procedure dropped to 77 min for the last 10 patients, which was 20 min longer than the E surgeon. The resection deviations of the IE and E surgeon were comparable, except for the posterolateral femoral resection, which the IE surgeon under-resected by a mean of -0.8 mm (p < 0.0001). At a mean follow-up of 9 and 17 months, the Forgotten Joint Score, Oxford Knee Score, KOOS, and the alignment of the components and limbs were not different between the IE and E surgeon (p ≥ 0.6994). A surgeon that switches to unrestricted KA with manual instruments can determine their learning curve by computing the deviation of the distal and posterior femoral resections from the planned resection. Based on the present study, an IE surgeon could have resection accuracy, post-operative patient outcomes, and component alignment comparable to an E surgeon.},
  language  = {en}
}
@article{ThibaudeauTaubenbergerHolzapfeletal.2014,
  author    = {Thibaudeau, Laure and Taubenberger, Anna V. and Holzapfel, Boris M. and Quent, Verena M. and Fuehrmann, Tobias and Hesami, Parisa and Brown, Toby D. and Dalton, Paul D. and Power, Carl A. and Hollier, Brett G. and Hutmacher, Dietmar W.},
  title     = {A tissue-engineered humanized xenograft model of human breast cancer metastasis to bone},
  series = {Disease Models \& Mechanisms},
  volume    = {7},
  journal   = {Disease Models \& Mechanisms},
  number    = {2},
  doi       = {10.1242/dmm.014076},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-117466},
  pages     = {299-309},
  year      = {2014},
  abstract  = {The skeleton is a preferred homing site for breast cancer metastasis. To date, treatment options for patients with bone metastases are mostly palliative and the disease is still incurable. Indeed, key mechanisms involved in breast cancer osteotropism are still only partially understood due to the lack of suitable animal models to mimic metastasis of human tumor cells to a human bone microenvironment. In the presented study, we investigate the use of a human tissue-engineered bone construct to develop a humanized xenograft model of breast cancer-induced bone metastasis in a murine host. Primary human osteoblastic cell-seeded melt electrospun scaffolds in combination with recombinant human bone morphogenetic protein 7 were implanted subcutaneously in non-obese diabetic/severe combined immunodeficient mice. The tissue-engineered constructs led to the formation of a morphologically intact 'organ' bone incorporating a high amount of mineralized tissue, live osteocytes and bone marrow spaces. The newly formed bone was largely humanized, as indicated by the incorporation of human bone cells and human-derived matrix proteins. After intracardiac injection, the dissemination of luciferase-expressing human breast cancer cell lines to the humanized bone ossicles was detected by bioluminescent imaging. Histological analysis revealed the presence of metastases with clear osteolysis in the newly formed bone. Thus, human tissue-engineered bone constructs can be applied efficiently as a target tissue for human breast cancer cells injected into the blood circulation and replicate the osteolytic phenotype associated with breast cancer-induced bone lesions. In conclusion, we have developed an appropriate model for investigation of species-specific mechanisms of human breast cancer-related bone metastasis in vivo.},
  language  = {en}
}
@article{NedopilHowellHull2022,
  author    = {Nedopil, Alexander J. and Howell, Stephen M. and Hull, Maury L.},
  title     = {A TKA insert with a lateral flat articular surface maximizes external and internal tibial orientations without anterior lift-off relative to low- and ultracongruent surfaces},
  series = {Journal of Personalized Medicine},
  volume    = {12},
  journal   = {Journal of Personalized Medicine},
  number    = {8},
  issn      = {2075-4426},
  doi       = {10.3390/jpm12081274},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-286142},
  year      = {2022},
  abstract  = {Background: In total knee arthroplasty (TKA), inserts can have different levels of medial and lateral congruency determined by the acuteness of the upslopes of the anterior and posterior articular surfaces. The present study evaluated an insert with different levels of lateral congruency and a medial ball-in-socket congruency to test the hypothesis that a lateral flat (F) insert maximizes external tibial orientation at extension and internal orientation at 90° flexion and lowers the incidence of anterior lift-off relative to low-congruent (LC) and ultracongruent (UC) lateral inserts. Methods: Two surgeons treated 23 patients with unrestricted caliper-verified kinematic alignment (KA) and posterior cruciate ligament (PCL) retention. They randomly trialed inserts with a medial radial dial that functioned as a built-in goniometer by measuring the tibial orientation relative to a sagittal line on the femoral trial component. Anterior lift-off of the insert from the baseplate indicated PCL tightness. Results: The F insert's mean of 9° of external tibial orientation was higher than that of the LC (5°, p < 0.0001) and UC inserts (2°, p < 0.0001). The -13° of internal tibial orientation at 90° flexion was higher than that of the LC (-9°, p < 0.0001) and UC inserts (-7°, p < 0.0001). The 0\% incidence of anterior lift-off was less than that of the LC (26\%) and UC inserts (57\%) (p < 0.0001). Conclusions: Surgeons and implant manufacturers should know that adding congruency to the lateral articular surface limits external tibial orientation in extension and internal tibial orientation at 90° flexion and overtightens the PCL. These rotational limitations and flexion space tightness can adversely affect patellofemoral tracking and knee flexion.},
  language  = {en}
}
@phdthesis{Roller2005,
  author    = {Roller, Christian},
  title     = {Abriebverhalten der Harris-Galante-Pfanne in Kombination mit 28mm Keramik- und Metallk{\"o}pfen},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-14197},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2005},
  abstract  = {Obwohl Simulatoruntersuchungen geringere Abriebwerte f{\"u}r Keramik-K{\"o}pfe gezeigt haben, konnten klinische Studien diese Erkenntnisse bisher nicht best{\"a}tigen. Bisher existiert keine Studie mit einer angemessenen Testst{\"a}rke, die das Abriebverhalten von 28 mm CoCr- und Biolox-K{\"o}pfen vergleicht. Ziel dieser Studie war es, das in-vivo-Abriebverhalten von Keramik- und Metall-K{\"o}pfen in Verbindung mit der Harris-Galante-Pfanne zu untersuchen. Bei allen Patienten wurde ein zementfreies Pfannenimplantat nach Harris-Galante (Zimmer) implantiert. Die Inlays bestanden aus konventionell gefertigtem UHMWPE. 108 Patienten erhielten CoCr-K{\"o}pfe, 99 weitere Patienten wurden mit Keramik-K{\"o}pfen (Biolox) versorgt. Die 2D-Abriebrate wurde mit der Hip-analysis-suite von Martell {\"u}ber einen Zeitraum von 5,2 Jahren bei den Biolox- beziehungsweise 8 Jahren bei den CoCr-K{\"o}pfen untersucht. Die Metall-K{\"o}pfe zeigten einen linearen Abrieb von 0,14 \&\#61617; 0,11 mm pro Jahr, verglichen mit 0,13 \&\#61617; 0,08 mm pro Jahr bei den Keramik-K{\"o}pfen. Dieser Unterschied war, insbesondere nach Anpassung an die klinischen Einflussfaktoren, nicht signifikant (p = 0,46). Die Power-Analyse zeigte eine Testst{\"a}rke von 80\%, einen Unterschied von 28\% (0,038 mm pro Jahr) zu detektieren. Die vorliegende Studie ist die erste, die das Abriebverhalten von 28 mm Metall- und Keramik-K{\"o}pfen im gleichen Pfannenimplantat mit ausreichender Testst{\"a}rke vergleicht. Mit einer Testst{\"a}rke von 80\%, eine Abriebreduktion um 28\% zu erkennen, zeigt diese Studie keinen Unterschied zwischen Biolox- und Metall-K{\"o}pfen in Verbindung mit konventionellen UHMWPE-Inlays in einer modularen Pfanne.},
  language  = {de}
}
@article{StaabHottowitzSohnsetal.2014,
  author    = {Staab, Wieland and Hottowitz, Ralf and Sohns, Christian and Sohns, Jan Martin and Gilbert, Fabian and Menke, Jan and Niklas, Andree and Lotz, Joachim},
  title     = {Accelerometer and Gyroscope Based Gait Analysis Using Spectral Analysis of Patients with Osteoarthritis of the Knee},
  series = {Journal of Physical Therapy Science},
  volume    = {26},
  journal   = {Journal of Physical Therapy Science},
  number    = {7},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-115907},
  pages     = {997-1002},
  year      = {2014},
  abstract  = {[Purpose] A wide variety of accelerometer tools are used to estimate human movement, but there are no adequate data relating to gait symmetry parameters in the context of knee osteoarthritis. This study's purpose was to evaluate a 3D-kinematic system using body-mounted sensors (gyroscopes and accelerometers) on the trunk and limbs. This is the first study to use spectral analysis for data post processing. [Subjects] Twelve patients with unilateral knee osteoarthritis (OA) (10 male) and seven age-matched controls (6 male) were studied. [Methods] Measurements with 3-D accelerometers and gyroscopes were compared to video analysis with marker positions tracked by a six-camera optoelectronic system (VICON 460, Oxford Metrics). Data were recorded using the 3D-kinematic system. [Results] The results of both gait analysis systems were significantly correlated. Five parameters were significantly different between the knee OA and control groups. To overcome time spent in expensive post-processing routines, spectral analysis was performed for fast differentiation between normal gait and pathological gait signals using the 3D-kinematic system. [Conclusions] The 3D-kinematic system is objective, inexpensive, accurate and portable, and allows long-term recordings in clinical, sport as well as ergonomic or functional capacity evaluation (FCE) settings. For fast post-processing, spectral analysis of the recorded data is recommended.},
  language  = {en}
}
@article{ArnholdtKamawalHorasetal.2020,
  author    = {Arnholdt, J{\"o}rg and Kamawal, Yama and Horas, Konstantin and Holzapfel, Boris M. and Gilbert, Fabian and Ripp, Axel and Rudert, Maximilian and Steinert, Andre F.},
  title     = {Accurate implant fit and leg alignment after cruciate-retaining patient-specific total knee arthroplasty},
  series = {BMC Musculoskeletal Disorders},
  volume    = {21},
  journal   = {BMC Musculoskeletal Disorders},
  doi       = {10.1186/s12891-020-03707-2},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-230012},
  year      = {2020},
  abstract  = {Background For improved outcomes in total knee arthroplasty (TKA) correct implant fitting and positioning are crucial. In order to facilitate a best possible implant fitting and positioning patient-specific systems have been developed. However, whether or not these systems allow for better implant fitting and positioning has yet to be elucidated. For this reason, the aim was to analyse the novel patient-specific cruciate retaining knee replacement system iTotal (TM) CR G2 that utilizes custom-made implants and instruments for its ability to facilitate accurate implant fitting and positioning including correction of the hip-knee-ankle angle (HKA). Methods We assessed radiographic results of 106 patients who were treated with the second generation of a patient-specific cruciate retaining knee arthroplasty using iTotal\(^{TM}\) CR G2 (ConforMIS Inc.) for tricompartmental knee osteoarthritis (OA) using custom-made implants and instruments. The implant fit and positioning as well as the correction of the mechanical axis (hip-knee-ankle angle, HKA) and restoration of the joint line were determined using pre- and postoperative radiographic analyses. Results On average, HKA was corrected from 174.4 degrees +/- 4.6 degrees preoperatively to 178.8 degrees +/- 2.2 degrees postoperatively and the coronal femoro-tibial angle was adjusted on average 4.4 degrees. The measured preoperative tibial slope was 5.3 degrees +/- 2.2 degrees (mean +/- SD) and the average postoperative tibial slope was 4.7 degrees +/- 1.1 degrees on lateral views. The joint line was well preserved with an average modified Insall-Salvati index of 1.66 +/- 0.16 pre- and 1.67 +/- 0.16 postoperatively. The overall accuracy of fit of implant components was decent with a measured medial overhang of more than 1 mm (1.33 mm +/- 0.32 mm) in 4 cases only. Further, a lateral overhang of more than 1 mm (1.8 mm +/- 0.63) (measured in the anterior-posterior radiographs) was observed in 11 cases, with none of the 106 patients showing femoral notching. Conclusion The patient-specific iTotal\(^{TM}\) CR G2 total knee replacement system facilitated a proper fitting and positioning of the implant components. Moreover, a good restoration of the leg axis towards neutral alignment was achieved as planned. Nonetheless, further clinical follow-up studies are necessary to validate our findings and to determine the long-term impact of using this patient- specific system.},
  language  = {en}
}
@article{HolzapfelProdingerPilgeetal.2013,
  author    = {Holzapfel, Boris Michael and Prodinger, Peter M. and Pilge, Hakan and Banke, Ingo J. and B{\"u}rklein, Dominik and Miethke, Thomas and Gradinger, Reiner},
  title     = {Acute Osteomyelitis of the Humerus mimicking Malignancy: Streptococcus pneumoniae as Exceptional Pathogen in an Immunocompetent Adult},
  series = {BMC Infectious Diseases},
  journal   = {BMC Infectious Diseases},
  doi       = {10.1186/1471-2334-13-266},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-95790},
  year      = {2013},
  abstract  = {Background Chronic osteomyelitis due to direct bone trauma or vascular insufficiency is a frequent problem in orthopaedic surgery. In contrast, acute haematogenous osteomyelitis represents a rare entity that almost exclusively affects prepubescent children or immunodeficient adults. Case Presentation In this article, we report the case of acute pneumococcal osteomyelitis of the humerus in an immunocompetent and otherwise healthy 44-year-old male patient presenting with minor inflammation signs and misleading clinical features. Conclusions The diagnosis had to be confirmed by open biopsy which allowed the initiation of a targeted therapy. A case of pneumococcal osteomyelitis of a long bone, lacking predisposing factors or trauma, is unique in adults and has not been reported previously.},
  language  = {en}
}
@article{EbertBenischKrugetal.2015,
  author    = {Ebert, Regina and Benisch, Peggy and Krug, Melanie and Zeck, Sabine and Meißner-Weigl, Jutta and Steinert, Andre and Rauner, Martina and Hofbauer, Lorenz and Jakob, Franz},
  title     = {Acute phase serum amyloid A induces proinflammatory cytokines and mineralization via toll-like receptor 4 in mesenchymal stem cells},
  series = {Stem Cell Research},
  volume    = {15},
  journal   = {Stem Cell Research},
  doi       = {10.1016/j.scr.2015.06.008},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-148491},
  pages     = {231-239},
  year      = {2015},
  abstract  = {The role of serum amyloid A (SAA) proteins, which are ligands for toll-like receptors, was analyzed in human bone marrow-derived mesenchymal stem cells (hMSCs) and their osteogenic offspring with a focus on senescence, differentiation andmineralization. In vitro aged hMSC developed a senescence-associated secretory phenotype (SASP), resulting in enhanced SAA1/2, TLR2/4 and proinflammatory cytokine (IL6, IL8, IL1\(\beta\), CXCL1, CXCL2) expression before entering replicative senescence. Recombinant human SAA1 (rhSAA1) induced SASP-related genes and proteins in MSC, which could be abolished by cotreatment with the TLR4-inhibitor CLI-095. The same pattern of SASP-resembling genes was stimulated upon induction of osteogenic differentiation, which is accompanied by autocrine SAA1/2 expression. In this context additional rhSAA1 enhanced the SASP-like phenotype, accelerated the proinflammatory phase of osteogenic differentiation and enhanced mineralization. Autocrine/paracrine and rhSAA1 via TLR4 stimulate a proinflammatory phenotype that is both part of the early phase of osteogenic differentiation and the development of senescence. This signaling cascade is tightly involved in bone formation and mineralization, but may also propagate pathological extraosseous calcification conditions such as calcifying inflammation and atherosclerosis.},
  language  = {en}
}
@article{HochleitnerJuengstBrownetal.2015,
  author    = {Hochleitner, Gernot and J{\"u}ngst, Tomasz and Brown, Toby D and Hahn, Kathrin and Moseke, Claus and Jakob, Franz and Dalton, Paul D and Groll, J{\"u}rgen},
  title     = {Additive manufacturing of scaffolds with sub-micron filaments via melt electrospinning writing},
  series = {Biofabrication},
  volume    = {7},
  journal   = {Biofabrication},
  number    = {3},
  doi       = {10.1088/1758-5090/7/3/035002},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-254053},
  year      = {2015},
  abstract  = {The aim of this study was to explore the lower resolution limits of an electrohydrodynamic process combined with direct writing technology of polymer melts. Termed melt electrospinning writing, filaments are deposited layer-by-layer to produce discrete three-dimensional scaffolds for in vitro research. Through optimization of the parameters (flow rate, spinneret diameter, voltage, collector distance) for poly-ϵ-caprolactone, we could direct-write coherent scaffolds with ultrafine filaments, the smallest being 817 ± 165 nm. These low diameter filaments were deposited to form box-structures with a periodicity of 100.6 ± 5.1 μm and a height of 80 μm (50 stacked filaments; 100 overlap at intersections). We also observed oriented crystalline regions within such ultrafine filaments after annealing at 55 °C. The scaffolds were printed upon NCO-sP(EO-stat-PO)-coated glass slide surfaces and withstood frequent liquid exchanges with negligible scaffold detachment for at least 10 days in vitro.},
  language  = {en}
}
@phdthesis{WeissenbergergebKunz2023,
  author    = {Weissenberger [geb. Kunz], Manuela-Hermina},
  title     = {Adenoviraler Gentransfer von SOX9 zur chondrogenen Differenzierung von humanen mesenchymalen Stammzellen},
  doi       = {10.25972/OPUS-32122},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-321221},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2023},
  abstract  = {Der adenovirale SOX9-Gentransfer induziert nach 3-w{\"o}chiger in vitro Pelletkultur die chondrogene Differenzierung humaner mesenchymaler Stammzellen in Pelletkultur wirksamer als der TGFB1 Gentransfer mit geringerer Chondrozytenhypertrophie. Eine solche Technologie k{\"o}nnte zuk{\"u}nftig in vivo die Bildung von stabilerem hyalinem Knorpelregeneratgewebe erm{\"o}glichen.},
  subject      = {Hyaliner Knorpel},
  language  = {de}
}
@phdthesis{Freytag2005,
  author    = {Freytag, Andreas},
  title     = {Adh{\"a}renz humanpathogener Staphylokokken auf orthop{\"a}dischen Implantatmaterialien},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-14178},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2005},
  abstract  = {Die Anzahl an implantierten Gelenkendoprothesen hat in den letzten Jahrzehnten stark zugenommen. Mit ihr auch die Anzahl an Protheseninfektionen. Die Haupterreger sind Staphylokokken (>80\%). Diese sind in vivo unempfindlich gegen{\"u}ber Antibiotika und somit ist die einzige sinnvolle Therapie der Ausbau der infizierten Prothese, welcher lange und kostenspielige Krankenhausaufenthalte f{\"u}r den Patienten mit sich bringt. Der Grund f{\"u}r diese Resistenz der Bakterien liegt darin, dass sie zur Biofilmbildung f{\"a}hig sind und sehr gut an Fremdk{\"o}rper-Oberfl{\"a}chen adh{\"a}rieren k{\"o}nnen. Welche Methode nun geeignet ist, die Adh{\"a}renz von Staphylokokken am besten unter klinisch relevanten Bedingungen zu untersuchen, ist zu pr{\"u}fen. Das in der Arbeit entwickelte Modell erm{\"o}glicht eine semiquantitative Bestimmung der Adh{\"a}renz. F{\"u}r die Versuche wurden Metallpr{\"u}fk{\"o}rper aus Titan und Kobalt-Chrom-Legierung verwendet. Zuvor wurden diese Metalle mit bestimmen Reinigungs- und Sterilisationsvorg{\"a}ngen ges{\"a}ubert. Ein Teil der verwendeten Pr{\"u}fk{\"o}rper ist vor Beimpfung mit den Keimen durch Serumproteine bzw. Gewebsfl{\"u}ssigkeiten beschichtet worden, um das Anheftungsverhalten unter verschiedenen Bedingungen beurteilen zu k{\"o}nnen. Hierf{\"u}r wurden Albumin, Kollagen Typ I und Typ II, Fibronektin und Fibrinogen verwendet. Sieben Titan-Pr{\"u}fk{\"o}rper sind in Schlieren (Schweiz) durch ein spezielles Verfahren mit PLL-g-PEG, einem Makromolek{\"u}l welches die Adh{\"a}sion von Proteinen herabsetzt, beschichtet worden. Eine Auswirkung durch Infektionen sollte hierbei {\"u}berpr{\"u}ft werden. Die Auswertung wurde unter REM-Betrachtung durchgef{\"u}hrt. Hierbei ist eine semiquantitative Abstufung der Adh{\"a}renzkraft von 1-5 getroffen worden. In den Ergebnissen zeigten die beiden verwendeten Metalle Titan und Kobalt-Chrom-Legierung keine wesentlichen Unterschiede in der gezeigten Adh{\"a}renz von Staphylokokken. Durch die Serumprotein- und Gewebsfl{\"u}ssigkeitsbeschichtung ließen sich Unterschiede unter verschiedenen Bedingungen feststellen. Fibronektin und Fibrinogen bewirken eine starke Zunahme an adh{\"a}renten Bakterienzellen. Kollagen Typ I und II zeigen eine leichte Adh{\"a}renzverst{\"a}rkung und bewirken Biofilmbildung. Albuminbeschichtung reduziert die Anzahl adh{\"a}renter Staphylokokken. Die PLL-g-PEG Beschichtung l{\"o}st starke Adh{\"a}renz und Biofilmbildung aus. Die hier angewandte Methode, kontaminierte Metallpr{\"u}fk{\"o}rper unter dem Rasterelektronenmikroskop zu betrachten, eignet sich um das Adh{\"a}renzverhalten von Bakterien zu beurteilen. Dabei lassen sich die Versuchsbedingungen auf vielfache Weise ver{\"a}ndern. Verschiedene Metalle und andere Materialien k{\"o}nnen miteinander verglichen werden. Des Weiteren ist es m{\"o}glich, unterschiedliche Proteinbeschichtungen vorzunehmen, um deren Einfluss auf die Adh{\"a}renz zu zeigen. Zus{\"a}tzlich ist eine Durchf{\"u}hrung der Versuche unter Bewegung m{\"o}glich, was eine Ann{\"a}herung an die Verh{\"a}ltnisse im menschlichen K{\"o}rper bedeutet. Neben Staphylokokken k{\"o}nnten auch andere Bakterienspezies untersucht werden. In dieser Studie wird erstmals gezeigt, dass Kollagen eine Biofilmbildung bei Staphylokokken induziert. Dies bedarf weiterer Untersuchung, welcher Mechanismus hierf{\"u}r verantwortlich ist. Die PLL-g-PEG Beschichtung hat auf Infektionen keine erfolgsversprechende Wirkung. Im Gegenteil, es kommt zu einer starken Besiedlung des Fremdmaterials. Albumin dagegen zeichnet sich durch eine Herabsetzung der Adh{\"a}renzst{\"a}rke aus. Daraus k{\"o}nnte man therapeutischen Nutzen ziehen und Implantate vor Einbau mit Albumin beschichten.},
  language  = {de}
}
@article{RudertHolzapfelJakubietz2011,
  author    = {Rudert, Maximilian and Holzapfel, Boris Michael and Jakubietz, Michael},
  title     = {Adjuvant Radiotherapy},
  series = {Deutsches {\"A}rzteblatt International},
  volume    = {108},
  journal   = {Deutsches {\"A}rzteblatt International},
  number    = {33},
  doi       = {10.3238/arztebl.2011.0553a},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-133571},
  pages     = {553},
  year      = {2011},
  abstract  = {No abstract available.},
  language  = {en}
}
@article{Trivanović2022,
  author    = {Trivanović, Drenka},
  title     = {Adult stem cells in aging},
  series = {Journal of Personalized Medicine},
  volume    = {12},
  journal   = {Journal of Personalized Medicine},
  number    = {5},
  issn      = {2075-4426},
  doi       = {10.3390/jpm12050795},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-275226},
  year      = {2022},
  abstract  = {No abstract available},
  language  = {en}
}
@phdthesis{vonRottkay2015,
  author    = {von Rottkay, Eberhard},
  title     = {Aktivit{\"a}t und Funktionalit{\"a}t nach H{\"u}fttotalendoprothese {\"u}ber einen direkten anterioren Zugang verglichen mit einem gesunden Bev{\"o}lkerungskollektiv},
  doi       = {10.25972/OPUS-17820},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-178206},
  school      = {Universit{\"a}t W{\"u}rzburg},
  year      = {2015},
  abstract  = {Die M{\"o}glichkeiten der operativen Rekonstruktion degenerativ ver{\"a}nderter H{\"u}ftgelenke sind komplex und vielf{\"a}ltig. Bei den derzeit zur Verf{\"u}gung stehenden operativen Behandlungsmassnahmen f{\"u}hren die Vor- und Nachteile immer wieder zur Diskussionen und Abw{\"a}gung der Operationsverfahren. Hierbei stehen sich die rasche postoperative Mobilisierung sowie eine verminderte Rekonvaleszenzzeit mit den diskutierten Nachteilen einer schlechteren {\"U}bersichtlichkeit und damit verbundenen Fehlimplantationen gegen{\"u}ber. Dies und die damit verbundene volkswirtschaftliche Bedeutung sind ein st{\"a}ndiger Ausgangspunkt f{\"u}r das Bem{\"u}hen den optimalen Zugangsweg zu etablieren. Daher stellte das von Smith-Peterson 1949 publizierte Verfahren einen Meilenstein in der operativen Therapie dar. Hierdurch konnten zum einen die operationstechnischen Vorteile wie auch das volkswirtschaftliche Begehren nach k{\"u}rzeren postoperativen Verweildauern vereint werden. Die Modifizierung dieses Zugangsweges hat sich bereits in einer großen Anzahl prospektiver Studien als zuverl{\"a}ssiges Rekonstruktionsverfahren etabliert und erf{\"u}llt zudem auch die Anforderungen der heutigen Medizin nach {\"a}sthetisch sch{\"o}nen Ergebnissen. In der vorliegenden Arbeit wurde eine prospektive Fallstudie des direkten anterioren Zugangs mit einem gesunden Vergleichskollektiv durchgef{\"u}hrt. Mit dem Ziel, die Aktivit{\"a}t ein Jahr postoperativ nach Implantation einer HTEP mit gesunden Probanden zu vergleichen. Von Januar 2009 bis Mai 2011 wurden insgesamt 77 Patienten und 59 Probanden in die Studie aufgenommen. Als Vergleichswerte wurde zum einen die klinische wie auch die radiologische Untersuchung herangezogen. In der klinischen Untersuchung zeigte sich insgesamt ein signifikanter Anstieg der untersuchten Scores im Vergleich mit den pr{\"a}operativen Ergebnissen bei den Operierten. Im Vergleich zu den Probanden erzielen die Patienten ein Jahr nach HTEP teilweise noch schlechtere Werte in dem Bewegungsumfang und den Aktivit{\"a}tsniveaus welche mittels der Auswertung des Stepwatches, des TWB und des Arzt-Patienten-Fragebogens erhoben wurden. Die radiologische Bewertung diente zur Feststellung der Positionierung der HTEP. Mit guten Positionierungen durch den direkten anterioren Zugang. Die Bewertung der Funktionalit{\"a}t zwischen den beiden Gruppen erfolgte durch den HHS, XSFMA- D und den Arzt-Patientenfragenbogen. Hierbei konnten {\"a}hnliche Ergebnisse, wie bereits oben beschrieben, verzeichnet werden mit guten Werten in der Gruppe der untersuchten Patienten, jedoch einer geringeren Funktionalit{\"a}t im Vergleich zu den Probanden. Die vorliegende Arbeit zeigt, dass der direkte anteriore Zugang die Wiederherstellung eines guten postoperativen Gesundheitszustandes mit erreichen eines hohen postoperativen Aktivit{\"a}tslevels der Patienten erm{\"o}glicht. Ebenso erf{\"u}llt dieser Zugangsweg die Anforderungen der heutigen Medizin im Sinne einer schnellen postoperativen Mobilisation. Im Vergleich zu anderen minimal-invasiven Verfahren zeigen sich eine gute Implantierbarkeit, eine gute Positionierung und ein niedriges Komplikationsniveau. Prinzipiell hat der minimal-invasive anteriore Zugang das Potenzial sich als ein Standardverfahren in der operativen Rekonstruktion bei H{\"u}ftgelenksersatz zu etablieren, jedoch w{\"a}re ein direkter Vergleich mit dem lateralen Zugang erstrebenswert und sollte in weiteren Studien verglichen werden.},
  subject      = {AMIS},
  language  = {de}
}