TY - THES A1 - George, Enrico T1 - Temporäre Hemiepiphyseodese bei idiopathischen Beinachsenfehlstellungen - klinische und radiologische Gegenüberstellung der VaWiKo® EPI-PLATTE und PediatrOS™ FlexTack™ - eine retrospektive Studie T1 - Temporary hemiepiphysiodesis with idiopathic leg axis malalignment - clinical and radiological comparison of the VaWiKo® EPI-PLATTE and PediatrOS™ FlexTack™ - a retrospective study N2 - Beinachsenfehlstellungen im Kindesalter zählen zu den häufigsten Wachstums- und Entwicklungsstörungen der unteren Extremitäten. Eine daraus resultierende Prädisposition für degenerative Erkrankungen begründet die Bedeutung der operativen Korrektur bei noch geöffneten Wachstumsfugen mittels temporärer Hemiepiphyseodese. Zur Beurteilung des Therapieerfolges wurden insgesamt 140 Beinachsen mit idiopathischen Achsfehlstellungen retrospektiv betrachtet. In den Jahren 2017 bis 2021 wurden mit der VaWiKo® EPI-PLATTE und der PediatrOS™ FlexTack™ zwei unterschiedliche Implantate zur temporären Hemiepiphyseodese in der kinderorthopädischen Klinik des Marienstift Arnstadt verwendet. Entsprechend der verwendeten Implantate erfolgte die Einteilung in zwei Patientengruppen, die sowohl klinisch als auch radiologisch jeweils prä- und postoperativ gegenübergestellt wurden. Bei Patienten/-innen mit einer Beinachsenkorrektur durch die VaWiKo® EPI-PLATTE ergab sich durchschnittlich eine signifikant kürzere Explantationsdauer (EP 26,05 min; FT 35,60 min) sowie eine kürzere Durchleuchtungszeit in Winkelminuten (EP 0,03; FT 0,07) im Rahmen der Explantation. Dem gegenüber steht die signifikant kürzere stationäre Aufenthaltsdauer in Tagen bei der Im- und Explantation der PediatrOS™ FlexTack™. (EP 5,43/ 3,73; FT 4,52/ 3,35). In Bezug auf die zur Wachstumskorrektur benötigten Zeit in Tagen resultiert in der Varus-Gruppe ein signifikanter Unterschied zugunsten der PediatrOS™ FlexTack™, (EP 517; FT 299) wohingegen sich in der Valgus-Gruppe kein signifikanter Unterschied zwischen beiden Implantaten zeigte (EP 343; FT 334). Zusammenfassend traten zwei Komplikationen auf, die jeweils Kinder aus der PediatrOS™ FlexTack™-Gruppe betrafen. Sowohl die PediatrOS™ FlexTack™ als auch die VaWiKo® EPI-PLATTE konnten die gewünschte Beinachsenkorrektur erzielen. Die in der Literatur mit der PediatrOS™ FlexTack™ in Verbindung gebrachten kürzeren Implantations- und Durchleuchtungszeiten sowie die kürzeren Therapiedauern des Genu valgum konnten im Vergleich zur VaWiKo® EPI-PLATTE nicht bestätigt werden. N2 - In the study, the VaWiKo® EPI-PLATTE (EP) and PediatrOS™ FlexTack™ (FT) were opposed as implants for temporary hemiepiphysiodesis to establish a direct comparability and therefore being able to show possible therapeutic consequences. The aim of the study was to make a prospectively preoperative statement on the selection of the implant to be chosen in view of the co-factors. In the years from 2017 to 2021, a total of eighty children with idiopathic leg axis malpositions were surgically treated in the Department of Paediatric Orthopaedics at Marienstift Arnstadt. According to the implants used, the patients were divided into two groups of 40 children each. To evaluate the success of the therapy, the resulting 140 leg axes were examined retrospectively. To verify the leg axis malalignment, the intermalleolar distance was used clinically on the one hand and the MAD/mLDFW/mMPTW and aFTW were used radiologically with full length x-rays taken pre- and postoperatively on the other. Of the 80 patients, 29 (36.25%) were female and 51 (63.75%) male. A total of 140 leg axis malpositions were corrected, 12 (8.57%) were varus and 128 (91.43%) valgus axes. The average age at the time of surgery was 12.74 years. The mean preoperative intermalleolar distance of 11.83 cm in the 55 patients with bilateral valgus deformity showed no significant difference between the two groups (p=0.294). The mean MAD in the valgus group was -16.52 mm preoperatively (p=0.966) and 3.60 mm postoperatively (p=0.125). The preoperatively measured mLDFW, mMPTW and aFTW did not show any significant difference in the comparison of the VaWiKo® EPI-PLATTE and PediatrOS™ FlexTack™, so that a homogeneous patient population was there. Patients with leg axis correction using the VaWiKo® EPI-PLATTE had a significantly shorter explantation time (p=0,006) and a shorter fluoroscopy time in angular minutes (p=0,005) during explantation. These contrasts with the significantly shorter inpatient length of stay in days during implantation and explantation of the PediatrOS™ FlexTack™. (EP 5.43/ 3.73; FT 4.52/ 3.35). In relation to the time required for growth correction in days, there was a significant difference in favour of the PediatrOS™ FlexTack™ in the varus group (EP 517; FT 299), whereas there was no significant difference between the two implants in the valgus group (EP 343; FT 334). Two complications occurred, each affecting children in the PediatrOS™ FlexTack™ group. Both the PediatrOS™ FlexTack™ and the VaWiKo® EPI-PLATTE were able to achieve the desired leg axis correction. The VaWiKo® EPI-PLATTE was more convincing with shorter explantation times and fluoroscopy times an no documented complications compared to the PediatrOS™ FlexTack™. The PediatrOS™ FlexTack™ impressed with a shorter therapy duration in the correction of varus deformities. KW - Epiphyseodese KW - Temporäre Hemiepiphyseodese Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-327338 ER - TY - JOUR A1 - Heinz, Tizian A1 - Meller, Felix A1 - Luetkens, Karsten Sebastian A1 - Anderson, Philip Mark A1 - Stratos, Ioannis A1 - Horas, Konstantin A1 - Rudert, Maximilian A1 - Reppenhagen, Stephan A1 - Weißenberger, Manuel T1 - The AMADEUS score is not a sufficient predictor for functional outcome after high tibial osteotomy JF - Journal of Experimental Orthopaedics N2 - Purpose The Area Measurement And Depth Underlying Structures (AMADEUS) classification system has been proposed as a valuable tool for magnetic resonance (MR)-based grading of preoperatively encountered chondral defects of the knee joint. However, the potential relationship of this novel score with clinical data was yet to determine. It was the primary intention of this study to assess the correlative relationship of the AMADEUS with patient reported outcome scores in patients undergoing medial open-wedge high tibial valgus osteotomy (HTO). Furthermore, the arthroscopic ICRS (International Cartilage Repair Society) grade evaluation was tested for correlation with the AMADEUS classification system. Methods This retrospective, monocentric study found a total of 70 individuals that were indicated for HTO due to degenerative chondral defects of the medial compartment between 2008 and 2019. A preoperative MR image as well as a pre-osteotomy diagnostic arthroscopy for ICRS grade evaluation was mandatory for all patients. The Knee Osteoarthritis Outcome Score (KOOS) including its five subscale scores (KOOS-ADL, KOOS-QOL, KOOS-Sports, KOOS-Pain, KOOS-Symptoms) was obtained preoperatively and at a mean follow-up of 41.2 ± 26.3 months. Preoperative chondral defects were evaluated using the AMADEUS classification system and the final AMADEUS scores were correlated with the pre- and postoperative KOOS subscale sores. Furthermore, arthroscopic ICRS defect severity was correlated with the AMADEUS classification system. Results There was a statistically significant correlation between the AMADEUS BME (bone marrow edema) subscore and the KOOS Symptoms subscore at the preoperative visit (r = 0.25, p = 0.04). No statistically significant monotonic association between the AMADEUS total score and the AMADEUS grade with pre- and postoperative KOOS subscale scores were found. Intraoperatively obtained ICRS grade did reveal a moderate correlative relation with the AMADEUS total score and the AMADEUS grade (r = 0.28, p = 0.02). Conclusions The novel AMADEUS classification system largely lacks correlative capacity with patient reported outcome measures in patients undergoing HTO. The MR tomographic appearance of bone marrow edema is the only parameter predictive of the clinical outcome at the preoperative visit. KW - cartilage KW - AMADEUS KW - KOOS KW - knee KW - high tibial osteotomy KW - chondral defect KW - osteoarthritis KW - PROM KW - correlation Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-357765 VL - 10 ER - TY - JOUR A1 - Heinz, Tizian A1 - Eidmann, Annette A1 - Anderson, Philip A1 - Weißenberger, Manuel A1 - Jakuscheit, Axel A1 - Rudert, Maximilian A1 - Stratos, Ioannis T1 - Trends in computer-assisted surgery for total knee arthroplasty in Germany: an analysis based on the operative procedure classification system between 2010 to 2021 JF - Journal of Clinical Medicine N2 - Alignment strategies for primary total knee arthroplasty (TKA) have changed significantly over time with a shift towards a more individualized alignment goal. At the same time, computer-assisted surgery (CAS) has gained interest for intraoperative control and accuracy in implant positioning and limb alignment. Despite the often discussed benefits and drawbacks of robotics and navigation for TKA, the routine use of these new devices on a day-to-day basis remains obscure. Therefore, nationwide hospital billing data based on the Operation Procedure Classification System (OPS) were retrieved from the Federal Statistical Office of Germany for the period from 2010 to 2021. OPS codes for primary total knee arthroplasty (OPS code: 5-822*) were further analyzed regarding the usage of computer navigation (additional OPS code: 5-988) or robotic devices (additional OPS code: 5-987). Gender and age at the time of surgery were also assessed. The results show a total of 2,226,559 primary TKAs were implanted between 2010 and 2021, of which 2,044,914 were performed conventionally (91.84% of all TKAs). A total of 170,276 TKAs were performed using navigation technique (7.65% of all TKAs) and another 11,369 TKAs were performed using robotics (0.51% of all TKAs). For the period from 2018 to 2021, a substantial increase in robot-assisted TKA (R-TKA) was observed, with an average increase rate of 84.74% per year, while the number of navigated TKAs declined (−3.67% per year). Computer-assisted surgery, and particularly robotics for TKA, are seeing growing popularity and stepwise translation into routine clinical use in Germany, with a steep increase rate of more than 80% per year since 2018. Nevertheless, the majority of TKAs are still performed using manual instrumentation, rendering conventional TKA the currently unchanged gold standard. KW - robotic KW - TKA KW - knee replacement KW - computer navigation KW - Germany Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-304879 SN - 2077-0383 VL - 12 IS - 2 ER - TY - JOUR A1 - Luetkens, Karsten Sebastian A1 - Grunz, Jan-Peter A1 - Kunz, Andreas Steven A1 - Huflage, Henner A1 - Weißenberger, Manuel A1 - Hartung, Viktor A1 - Patzer, Theresa Sophie A1 - Gruschwitz, Philipp A1 - Ergün, Süleyman A1 - Bley, Thorsten Alexander A1 - Feldle, Philipp T1 - Ultra-high-resolution photon-counting detector CT arthrography of the ankle: a feasibility study JF - Diagnostics N2 - 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. KW - photon-counting CT KW - arthrography KW - ankle KW - cartilage KW - radiation dosage Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-362622 SN - 2075-4418 VL - 13 IS - 13 ER - TY - THES A1 - Poker, Konrad Felix T1 - Vergleichende in vitro-Charakterisierung des Differenzierungspotentials humaner mesenchymaler Stromazellen aus verschiedenen Geweben des Kniegelenkes von Patientinnen mit Gonarthrose T1 - Comparison of the in vitro characterisation of the differentiation potential of human mesenchymal stromalcells derived from various tissus of the knee from patients with gonarthosis N2 - Humane mesenchymale Stromazellen (hMSCs) sind Interessengebiet der Forschung im Bereich des Tissue Engineering und werden häufig in Bezug auf Knorpelregeneration untersucht. Hierbei sind bereits mehrere potentielle Quellen nachgewiesen worden. Fokus dieser Disseration war die Vergleichende in vitro-Charakterisierung des Differenzierungspotentials von hMSCs von sechs verschiedenen Geweben des Kniegelenkes bei Patientinnen mit Gonarthrose um zu erforschen, welches Gewebe das meiste Potential für eine mögliche Extraktion von hMSCs birgt. Hierfür wurden Zellen aus der Spongiose, dem Knorpelgewebe, des vorderen Kreuzbandes, der Menisken, der Synovialmebran sowie des Hoffa’schen Fettkörpers von fünf verschiedenen Spenderinnen isoliert und apidogen, osteogen sowie chondrogen differenziert sowie anschließend histologisch, immunhistochemisch und molekularbiologisch untersucht und die Ergebnisse miteinander verglichen. Hierbei wurde die zunächst der Nachweis erbracht, dass es sich bei allen Zellen um hMSCs handelt sowie anschließend gezeigt, dass alle Zellen ein multipotentes Differenzierungspotential aufweisen. Während kein statistisch relevanter Nachweis erbracht werden konnte, dass eine Zellquelle hierbei überlegen ist, scheinen die Zellen der Spongiosa sowie der Synovialmembran das vielversprechendste Potential zu bieten und eigenen sich somit als Quelle für weitere Forschung. N2 - Human mesenchymal stromal cells (hMSCs) are a subject of interest in tissue engineering research and are often investigated in regard to cartialage regerenation. However no superior potential cell source has been found up to now. The aim of this study was to characterise the in vitro differentiation potential of hMSCs of six different tissues of the knee derived from patients with gonarthrosis and therefore to investigate which cell origin is showing the highest extraction potential. From five different female patients the cells of the bone marrow, the cartialage, the anterior cruciate ligament, the menisci, the synovial membrane and the infrapatellar fatty body were isolated and investigated using histological, immunhistochemical and molecular biological methods. Afterwards those findings were compared for further investigation. The study proved that all isolated cells were hMSCs and that all cells showed multipotent differentiation potential. While no statistically relevant superiority of either cell line could be proven it seemed that the cells extracted from the bone marrow and the synovial membrane did show the highest potential of being a promising source for further investigations. KW - Tissue Engineering KW - Kniegelenkarthrose KW - Mesenchymale Stromazellen KW - Knorpelregeneration KW - mesenchymal stromal cells KW - cartilage regeneration Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-302930 ER -