Lehrstuhl für Orthopädie
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- .................................................................... (1)
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Institute
- Lehrstuhl für Orthopädie (375)
- Klinik und Poliklinik für Unfall-, Hand-, Plastische und Wiederherstellungschirurgie (Chirurgische Klinik II) (15)
- Abteilung für Funktionswerkstoffe der Medizin und der Zahnheilkunde (7)
- Institut für diagnostische und interventionelle Radiologie (Institut für Röntgendiagnostik) (7)
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- Medizinische Klinik und Poliklinik II (6)
- Graduate School of Life Sciences (5)
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- Kinderklinik und Poliklinik (4)
- Pathologisches Institut (4)
Sonstige beteiligte Institutionen
- IZKF Nachwuchsgruppe Geweberegeneration für muskuloskelettale Erkrankungen (7)
- Bernhard-Heine-Centrum für Bewegungsforschung (4)
- König-Ludwig-Haus Würzburg (3)
- Orthopädische Klinik und Poliklinik der Universität Würzburg (2)
- König Ludwig Haus Würzburg (1)
- König-Ludwig Haus (1)
- Lehrstuhl für Regeneration Muskuloskelettaler Gewebe (1)
- Muskuloskelettalen Zentrum Würzburg (MCW) (1)
- Muskuloskelettales Centrum Würzburg (MCW) (1)
- Orthopädische Klinik König-Ludwig-Haus (1)
The objective of the study was to suggest a novel quantitative assessment of acetabular bone defects based on a statistical shape model, validate the method, and present preliminary results. Two exemplary CT-data sets with acetabular bone defects were segmented to obtain a solid model of each defect pelvis. The pathological areas around the acetabulum were excluded and a statistical shape model was fitted to the remaining healthy bone structures. The excluded areas were extrapolated such that a solid model of the native pelvis per specimen resulted (i.e., each pelvis without defect). The validity of the reconstruction was tested by a leave-one-out study. Validation results showed median reconstruction errors of 3.0 mm for center of rotation, 1.7 mm for acetabulum diameter, 2.1° for inclination, 2.5° for anteversion, and 3.3 mm3 for bone volume around the acetabulum. By applying Boolean operations on the solid models of defect and native pelvis, bone loss and bone formation in four different sectors were assessed. For both analyzed specimens, bone loss and bone formation per sector were calculated and were consistent with the visual impression. In specimen_1 bone loss was predominant in the medial wall (10.8 ml; 79%), in specimen_2 in the posterior column (15.6 ml; 46%). This study showed the feasibility of a quantitative assessment of acetabular bone defects using a statistical shape model-based reconstruction method. Validation results showed acceptable reconstruction accuracy, also when less healthy bone remains. The method could potentially be used for implant development, pre-clinical testing, pre-operative planning, and intra-operative navigation. © 2018 The Authors. Journal of Orthopaedic Research® Published by Wiley Periodicals, Inc. on behalf of Orthopaedic Research Society. J Orthop Res 9999:1–9, 2018.
In vitro co-cultures of different primary human cell types are pivotal for the testing and evaluation of biomaterials under conditions that are closer to the human in vivo situation. Especially co-cultures of macrophages and mesenchymal stem cells (MSCs) are of interest, as they are both present and involved in tissue regeneration and inflammatory reactions and play crucial roles in the immediate inflammatory reactions and the onset of regenerative processes, thus reflecting the decisive early phase of biomaterial contact with the host. A co-culture system of these cell types might thus allow for the assessment of the biocompatibility of biomaterials. The establishment of such a co-culture is challenging due to the different in vitro cell culture conditions. For human macrophages, medium is usually supplemented with human serum (hS), whereas hMSC culture is mostly performed using fetal calf serum (FCS), and these conditions are disadvantageous for the respective other cell type. We demonstrate that human platelet lysate (hPL) can replace hS in macrophage cultivation and appears to be the best option for co-cultivation of human macrophages with hMSCs. In contrast to FCS and hS, hPL maintained the phenotype of both cell types, comparable to that of their respective standard culture serum, as well as the percentage of each cell population. Moreover, the expression profile and phagocytosis activity of macrophages was similar to hS.
Cell adhesion in the multiple myeloma (MM) microenvironment has been recognized as a major mechanism of MM cell survival and the development of drug resistance. Here we addressed the hypothesis that the protein junctional adhesion molecule-A (JAM-A) may represent a novel target and a clinical biomarker in MM. We evaluated JAM-A expression in MM cell lines and in 147 MM patient bone marrow aspirates and biopsies at different disease stages. Elevated JAM-A levels in patient-derived plasma cells were correlated with poor prognosis. Moreover, circulating soluble JAM-A (sJAM-A) levels were significantly increased in MM patients as compared with controls. Notably, in vitro JAM-A inhibition impaired MM migration, colony formation, chemotaxis, proliferation and viability. In vivo treatment with an anti-JAM-A monoclonal antibody (αJAM-A moAb) impaired tumor progression in a murine xenograft MM model. These results demonstrate that therapeutic targeting of JAM-A has the potential to prevent MM progression, and lead us to propose JAM-A as a biomarker in MM, and sJAM-A as a serum-based marker for clinical stratification.
Die distale Radiusfraktur gehört zu den häufigsten Frakturen in Deutschland mit einem Inzidenzanstieg im Alter unter Betonung des weiblichen Geschlechts. Dabei zeigt sich ein zunehmender Trend in Richtung operative Versorgung, allen voran die Versorgung mittels winkelstabiler Plattensysteme. Instabile, distale Radiusfrakturen werden dabei vor geplanter operativer Versorgung im Rahmen der Initialbehandlung üblicherweise geschlossen reponiert und im Gipsverband retiniert. Ziel der vorliegenden monozentrischen, prospektiv randomisierten Studie mit zwei Studiengruppen war es herauszufinden, ob sich das Unterlassen der Reposition vor geplanter Operation nachteilig auf das Schmerzniveau in der präoperativen Phase auswirkt und ob sich durch die Dislokation Nachteile in Bezug auf den Nervus medianus im Sinne eines Traktionsschadens sowie bezüglich des klinisch-radiologischen Ausheilungsergebnisses zeigen.
Die Studie zeigte, dass das Schmerzempfinden während der präoperativen Gipsbehandlung unabhängig von einer vorherigen Reposition war. Für den primären Endpunkt an Tag 1 nach der Akutbehandlung konnte statistisch signifikante Nichtunterlegenheit der Gruppe ohne Reposition gegenüber der Gruppe mit Reposition nachgewiesen werden. Gleiches galt für Tag 2, sowohl für die absoluten Schmerzniveaus als auch für die Schmerzlinderung.
Das Unterlassen der Reposition hatte zudem keine nachteiligen Effekte auf den Nervus medianus.
Gleiches zeigte sich für das klinische und radiologische Ausheilungsergebnis. Für die funktionellen DASH- und Krimmer-Scores konnte ein Jahr postoperativ ebenfalls statistisch signifikante Nichtunterlegenheit der Gruppe ohne Reposition nachgewiesen werden.
Diese Erkenntnisse bestätigen die in der Literatur vorhandenen Ergebnisse verschiedener Studien dahingehend, dass das Unterlassen der Reposition keine nachteiligen Effekte auf das postoperative Outcome hat. Einige Studien verdeutlichen zudem, dass es nach Reposition, insbesondere bei Vorliegen gewisser Risiko- und Instabilitätsfaktoren, ohnehin zur sekundären Dislokation kommt, sodass die generelle Notwendigkeit der Reposition vor Gipsanlage sowohl vor einer operativen als auch vor einer konservativen Weiterbehandlung angezweifelt werden
muss.
Background and objectives: Cartilage surgery constitutes a standard intervention in foot and ankle procedures. Currently, there is a lack of epidemiological data on its frequency, age distribution, and surgical options for cartilage surgery. This study aimed to investigate the current landscape of cartilage surgery in Germany and identify the most common procedures from an epidemiological standpoint. Materials and methods: Medical billing and reporting data from the Federal Statistical Office of Germany, encompassing the period 2006–2020, was examined, including all foot and ankle cartilage surgical procedures (summarized under OPS codes 5-812 and 5-801). The dataset incorporated information on the affected joint, patient age and sex, and surgery type. Each surgical procedure was categorized as “debridement”, “regeneration” or “refixation”. Linear and nonlinear regression analyses were employed, with a statistical significance threshold of 0.05. Results: From the total of 136,501 procedures conducted during the study period, the most frequently performed interventions were microfracture (58,252) and chondroplasty (56,135), and thus, debridement procedures were in the leading position. The use of acellular membranes was the most used regenerative technique (n = 11,414). At the ankle joint, interventions were mostly arthroscopic and in men, while foot cartilage surgeries were preferably performed via open surgery and mostly in women. Age distribution analysis revealed two primary peaks: the first in the 20–25-year-old group (ankle and foot) and the second in the 45–50-year-old group (ankle) and 55–60-year-old group (foot). Refixation and regenerative procedures were more frequent among younger individuals, while debriding procedures were more frequent among older individuals. Regenerative procedures, particularly in the ankle, significantly increased over time. Conclusions: Cartilage surgery of the foot and ankle was common, with two primary age groups predominantly affected. Notably, recent years have witnessed a considerable rise in cartilage regenerative procedures.
In March 2020, Germany imposed a nationwide lockdown to curb the spread of COVID-19, prompting questions about the impact on the incidence of common fractures. This study examined 15 fracture types in pre-outbreak (2010–2019) and post-outbreak (2020–2021) periods, using data categorized by age (18–64 years, 65 years) and sex (male, female). Linear regression assessed annual growth rates, and mean fracture numbers were compared across periods for significant differences. Results indicated a positive correlation between fracture incidence rates and time for various types, such as cervical, thoracic, lumbar, and pelvic spine fractures, rib fractures, femoral neck, pertrochanteric femur, femoral shaft, and ankle fractures. Frequencies of proximal humerus, distal radius, femoral neck, pertrochanteric femur, femoral shaft, and ankle fractures in 2020 and 2021 were within predicted ranges from previous years. However, rib fractures and spinal fractures (cervical, thoracic, lumbar, and pelvic spine) occurred less frequently during this time. Notably, this study found a consistent decline in most fracture types for individuals aged 18–64 after the pandemic’s onset, while the fracture incidence of hip fractures, often referred to as fragility fractures, for those over 65 remained unchanged. Fibula fractures showed the most considerable decrease in both age groups. In conclusion, the COVID-19 pandemic substantially impacted fracture incidence, with lower rates among individuals under 65 and unchanged fragility fractures in the elderly population.
Ultra-high-resolution photon-counting detector CT arthrography of the ankle: a feasibility study
(2023)
This study was designed to investigate the image quality of ultra-high-resolution ankle arthrography employing a photon-counting detector CT. Bilateral arthrograms were acquired in four cadaveric specimens with full-dose (10 mGy) and low-dose (3 mGy) scan protocols. Three convolution kernels with different spatial frequencies were utilized for image reconstruction (ρ\(_{50}\); Br98: 39.0, Br84: 22.6, Br76: 16.5 lp/cm). Seven radiologists subjectively assessed the image quality regarding the depiction of bone, hyaline cartilage, and ligaments. An additional quantitative assessment comprised the measurement of noise and the computation of contrast-to-noise ratios (CNR). While an optimal depiction of bone tissue was achieved with the ultra-sharp Br98 kernel (S ≤ 0.043), the visualization of cartilage improved with lower modulation transfer functions at each dose level (p ≤ 0.014). The interrater reliability ranged from good to excellent for all assessed tissues (intraclass correlation coefficient ≥ 0.805). The noise levels in subcutaneous fat decreased with reduced spatial frequency (p < 0.001). Notably, the low-dose Br76 matched the CNR of the full-dose Br84 (p 0.999) and superseded Br98 (p < 0.001) in all tissues. Based on the reported results, a photon-counting detector CT arthrography of the ankle with an ultra-high-resolution collimation offers stellar image quality and tissue assessability, improving the evaluation of miniscule anatomical structures. While bone depiction was superior in combination with an ultra-sharp convolution kernel, soft tissue evaluation benefited from employing a lower spatial frequency.
Der MPFL-Ersatz ist ein gängiges Therapieverfahren zur Behandlung einer patellofemoralen Instabilität. Die Operationstechniken unterscheiden sich zumeist an der patellaren Fixationsmethode und der Auswahl der Transplantate. Biomechanische Studien, welche sich mit den Eigenschaften implantatfreier ossärer Fixationsmethoden beim MPFL-Ersatz unter Verwendung künstlicher Transplantate beschäftigen gibt es nach aktueller Recherche nicht. Ziel dieser Arbeit war es, die biomechanischen Eigenschaften zweier patellarer Bohrkanalfixationstechniken beim MPFL-Ersatz mit unterschiedlichem künstlichen Bandersatzmaterial zu ermitteln. Die Hypothese war, dass die biomechanischen Eigenschaften in Elongation, Steifigkeit, Primärstabilität und maximaler Ausreißkraft mit denen der bereits etablierten Verfahren und dem nativen MPFL vergleichbar sind. Hierzu wurden 80 porcine Kniescheiben randomisiert in 8 Gruppen aufgeteilt und getestet. In den Gruppen 1-4 wurden parallele, transpatellare Bohrkanäle mit Tapes der Breiten 2 mm, 3 mm, 4 mm und 5 mm getestet. In den Gruppen 5-8 wurden V-Kanal-Fixationsmethoden mit Bändern der Breite von 2 mm, 3 mm, 4 mm und 5 mm untersucht. Zusätzlich wurden die biomechanischen Grundeigenschaften der nativen Tapes ermittelt. Alle Tests durchliefen jeweils drei Messabschnitte. Hierbei fand zunächst eine Präkonditionierung mit 10 Zyklen zwischen 5 N und 20 N statt. Daraufhin folgte eine zyklische Belastung mit 1000 Zyklen zwischen 5 N und 50 N. Am Ende wurde eine maximale Kraftapplikation bis zum Versagen der Fixationskomplexe durchgeführt. Im Rahmen der Messungen wurden Elongation, Steifigkeit, Yield Load und Maximum Load bestimmt. Es konnten Unterschiede zwischen den beiden Fixationsmethoden und den verwendeten Tapes festgestellt werden. Alle acht Gruppen zeigten eine höhere Primärstabilität als das humane MPFL. Bezogen auf die biomechanischen Eigenschaften und den Versagensmechanismus konnte in dieser Studie ein Vorteil der parallelen transpatellaren Bohrkanäle gegenüber den V- Kanaltechniken festgestellt werden. Die Werte mit der höchsten maximalen Ausreißkraft wurden in Gruppe 3 (631,6 ± 83,1 N) und Gruppe 1 (592,9 ± 170,1 N) gemessen. Diese zeigten eine höhere Primärstabilität mit geringerer Elongation und Steifigkeit im Vergleich zu den in der aktuellen Literatur beschriebenen biomechanischen Studien, welche sich mit unterschiedlichen und teilweise bereits etablierten MPFL-Ersatzverfahren beschäftigten. Eine implantatfreie MPFL-Rekonstruktion mit transpatellaren parallelen Bohrkanälen unter Verwendung eines 2 mm Fiber Tapes (Fa. Arthrex) oder eines 4 mm Tapes (Fa. Topester) könnten dementsprechend eine gute Alternative zur operativen Therapie einer patellofemoralen Instabilität sein.
Introduction
Diagnosis and treatment of insertional tendinopathy of the Achilles tendon (IAT) remains a challenge. The aim of this study was to assess the influence of pre-operative radiological pathologies on the patient-reported outcomes following open debridement of all pathologies for IAT.
Materials and methods
In this IRB-approved retrospective correlation and comparative study, patients with pre-operative imaging were identified from the authors’ retrospective IAT database comprising of 118 patients. All were treated by a standardized surgical treatment strategy utilizing a midline, transachillary approach and debridement of all pathologies. A total of fifteen radiologic parameters were measured on radiographs (RX) and MRI. The patient-reported outcomes were assessed using the Victorian Institute of Sport Assessment-Achilles questionnaire (VISA-A-G) and the general health questionnaire SF-12 at a minimum follow-up of 12 months. The data are presented as mean ± SD (95% CI).
Results
88 patients (74.6%) with an average age of 50 ± 12 (47–52) years were included. Radiographs were available in 68 patients and MRI in 53. The mean follow-up was 3.8 ± 1.9 (3.4–4.3) years. The overall VISA-A-G was 81 ± 22 (77–86), the SF-12 PCS 54 ± 7 (52–55), and the SF-12 MCS 52 ± 9 (50–54) points. None of the assessed radiological parameters had a significant influence on the patient-reported outcome following surgical treatment for IAT.
Conclusion
In this retrospective correlation study, no significant association was found between preoperative radiographic and MRI radiologic parameters for IAT and postoperative patient-reported outcomes (VISA-A-G and SF-12).
Einleitung:
Die Ätiologie der Early Onset Arthrose (EOA) der Schulter ist bislang ungeklärt. Aufgrund des Einflusses der Muskeln der Rotatorenmanschette (RM) auf die glenohumerale Kinematik werden muskuläre Ursachen diskutiert. Ziel der Studie war es, entsprechende Faktoren anhand von Volumenmessungen der RM und Untersuchungen der angrenzenden knöchernen Strukturen in der MRT-Bildgebung sowie der Erfassung patientenspezifischer Charakteristika zu identifizieren.
Methoden:
In einer Fall-Kontroll-Studie wurden Schultern von 15 PatientInnen (14 Männer, 1 Frau) mit einer Omarthrose vor dem 60. Lebensjahr und 13 Kontrollpersonen (ausschließlich Männer) untersucht. Dabei wurden anthropometrische Körpermessungen sowie klinische Charakteristika erhoben. Anhand von MRT-Bildern wurden die Volumina der RM mittels manueller Umrandung der einzelnen Muskelquerschnitte berechnet. Weiterhin wurden die Winkel zwischen Coracoid bzw. Spina scapulae und Scapulakörper gemessen. Die Stellung der Scapula zum Thorax wurde anhand des Winkels der Scapula zur Tischebene erhoben. Zudem wurden die Glenoidretroversion, -morphologietypen und Humeruskopfsubluxation ermittelt. Die Auswertung erfolgte anhand deskriptiver und vergleichender statistischer Verfahren sowie logistischer und linearer Regressionsanalysen.
Ergebnisse:
Die Volumina der RM von PatientInnen mit EOA unterschieden sich weder absolut noch im relativen Verhältnis von denen der Kontrollpersonen. Dagegen konnten im Vergleich signifikant höhere Werte des Thoraxumfangs und -durchmessers, des Körpergewichts sowie des BMI bei erkrankten Personen nachgewiesen werden. Weiterhin übten diese signifikant häufiger Berufe aus, die mehr als 1400 kcal pro Tag verbrauchten. Das Risiko einer EOA nahm zu, je steiler die Scapula zum Thorax stand. PatientInnen mit B2-Glenoid wiesen signifikant größere Winkel zwischen Coracoid und Scapulakörper sowie höhere Werte des transversalen Thoraxdurchmessers auf, als erkrankte Personen mit einem B1-Glenoid. Unabhängig von einer Erkrankung mit EOA zeigte sich, dass das Ausüben einer Überkopfsportart mit einem höheren Subluxationsindex assoziiert war.
Fazit:
Während die RM keine Auffälligkeiten bei PatientInnen mit EOA zeigte, waren ein männliches Geschlecht, der BMI, die Thoraxform und Scapulastellung, sowie die Ausübung bestimmter Berufe und Sportarten mit der Erkrankung assoziiert. Weitere Studien müssen folgen, um diese Risikofaktoren bei EOA genauer zu untersuchen und mögliche Therapiekonzepte zu entwickeln. Dabei sollte auch die periphere Schultermuskulatur (z. B. M. teres major oder M. pectoralis major) in die Untersuchungen miteinbezogen werden.