TY  - JOUR
A1  - Weber, Patrick
A1  - Beck, Melina
A1  - Klug, Michael
A1  - Klug, Andreas
A1  - Klug, Alexander
A1  - Glowalla, Claudio
A1  - Gollwitzer, Hans
T1  - Survival of patient-specific unicondylar knee replacement
JF  - Journal of Personalized Medicine
N2  - Unicompartmental knee arthroplasty (UKA) in isolated medial or lateral osteoarthritis leads to good clinical results. However, revision rates are higher in comparison to total knee arthroplasty (TKA). One reason is suboptimal fitting of conventional off-the-shelf prostheses, and major overhang of the tibial component over the bone has been reported in up to 20% of cases. In this retrospective study, a total of 537 patient-specific UKAs (507 medial prostheses and 30 lateral prostheses) that had been implanted in 3 centers over a period of 10 years were analyzed for survival, with a minimal follow-up of 1 year (range 12 to 129 months). Furthermore, fitting of the UKAs was analyzed on postoperative X-rays, and tibial overhang was quantified. A total of 512 prostheses were available for follow-up (95.3%). Overall survival rate (medial and lateral) of the prostheses after 5 years was 96%. The 30 lateral UKAs showed a survival rate of 100% at 5 years. The tibial overhang of the prosthesis was smaller than 1 mm in 99% of cases. In comparison to the reported results in the literature, our data suggest that the patient-specific implant design used in this study is associated with an excellent midterm survival rate, particularly in the lateral knee compartment, and confirms excellent fitting.
KW  - unicompartmental knee arthroplasty
KW  - osteoarthritis
KW  - patient-specific implant
KW  - partial knee arthroplasty
KW  - patient-specific instruments
Y1  - 2023
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-313650
SN  - 2075-4426
VL  - 13
IS  - 4
ER  - 
TY  - JOUR
A1  - Holzapfel, Boris Michael
A1  - Rechl, Hans
A1  - Lehner, Stefan
A1  - Pilge, Hakan
A1  - Gollwitzer, Hans
A1  - Steinhauser, Erwin
T1  - Alloplastic Reconstruction of the Extensor Mechanism after Resection of Tibial Sarcoma [Research Article]
N2  - Reconstruction of the extensor mechanism is essential for good extremity function after endoprosthetic knee replacement following tumor resection. Only a few biological methods have been able to reliably restore a functional extensor mechanism, but they are often associated with significant complication rates. Reattachment of the patellar tendon to the prosthesis using an alloplastic patellar ligament (Trevira cord) can be an appropriate alternative. In vivo and in vitro studies have already shown that complete fibrous ingrowth in polyethylene chords can be seen after a period of six months. However, until now, no biomechanical study has shown the efficacy of an alloplastic cord and its fixation device in providing sufficient stability and endurance in daily life-activity until newly formed scar tissue can take over this function. In a special test bench developed for this study, different loading regimes were applied to simulate loads during everyday life. Failure loads and failuremodes were evaluated. The properties of the cord were compared before and after physiological conditioning. It was shown that rubbing was the mode of failure under dynamic loading. Tensile forces up to 2558N did not result in material failure. Thus, using an artificial cord together with this fixation device, temporary sufficient stable fixation can be expected.
KW  - Medizin
Y1  - 2011
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-69072
ER  -