Reduziert ein erhöhter tibialer Slope den Abrieb bei unikondylären Schlittenprothesen?

Weber, Patrick; Schröder, Christian; Utzschneider, Sandra; Schmidutz, Florian; Jansson, Volkmar; Müller, Peter E.

doi:10.1007/s00132-011-1857-8

Cited by 4 publications

(2 citation statements)

References 21 publications

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“…The range for the optimal tibial slope for example varied between 12° posterior and 5° anterior slope, corresponding to a range of 17°. Unfortunately, up to now little research has been performed in this area, and the optimal slope for an implantation of an UKA is still not known [15, 38]. Even if this meta‐analysis showed a precise positioning of the implants with navigation, the target has to be redefined by conducting studies that analyse the optimal positioning in UKA.…”

Section: Discussionmentioning

confidence: 99%

Improved accuracy in computer-assisted unicondylar knee arthroplasty: a meta-analysis

Weber

Crispin

Schmidutz

et al. 2013

Knee Surg Sports Traumatol Arthrosc

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The meta-analysis shows that the use of navigation systems in UKA leads to a more precise component position. Whether the more accurate position in UKA results in a better clinical outcome or long-term survival is yet unknown. Nevertheless, as a precise implant position appears to be beneficial, the use of navigation should be recommended for UKA. The limits defined by the manufacturers for an optimal positioning are not consistent.

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Section: Discussionmentioning

confidence: 99%

Improved accuracy in computer-assisted unicondylar knee arthroplasty: a meta-analysis

Weber

Crispin

Schmidutz

et al. 2013

Knee Surg Sports Traumatol Arthrosc

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“…Studies with long-term follow-up have demonstrated fewer complications and faster recovery compared with total knee arthroplasty (TKA) [ 1 – 3 ]. One factor in the long-term survival of UKA is the accuracy of implantation, and inaccurate implantation rates of up to 30% have been reported [ 4 – 6 ].…”

Section: Introductionmentioning

confidence: 99%

Can accuracy of component alignment be improved with Oxford UKA Microplasty® instrumentation?

Fan

Lau

et al. 2020

J Orthop Surg Res

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Background One factor in the long-term survivorship of unicompartmental knee arthroplasty is the accuracy of implantation. In addition to implant designs, the instrumentation has also evolved in the last three decades to improve the reproducibility of implant placement. There have been limited studies comparing mobile bearing unicompartmental knee arthroplasty with contemporary instrumentation and fixed bearing unicompartmental knee arthroplasty with conventional instrumentation. This study aims to determine whether the Microplasty instrumentation in Oxford unicompartmental knee arthroplasty allows the surgeon to implant the components more precisely and accurately. Methods A total of 150 patients (194 knees) were included between April 2013 and June 2019. Coronal and sagittal alignment of the tibial and femoral components was measured on postoperative radiographs. Component axial rotational alignment was measured on postoperative computer tomography. The knee rotation angle was the difference between the femoral and tibial axial rotation. A rotational mismatch was defined as a knee rotation angle of > 10°. Statistical analysis was performed using Student t test and Mann-Whitney nonparametric test. A p value < 0.05 was considered statistically significant in each analysis. Results Between April 2013 to June 2019, 112 patients (150 knees) received Oxford unicompartmental knee arthroplasty, one patient (2 knees) had Journey unicompartmental knee arthroplasty, and 37 patients (42 knees) received Zimmer unicompartmental knee arthroplasty. All femoral components in the Oxford group were implanted within the reference range, compared with 36.6% in the fixed bearing group ( p < 0.001). 88.3% of Oxford knees had tibial component falling within the reference range, whereas 56.1% of knees in the fixed bearing group fell within the reference range ( p < 0.001). 97.5% of Oxford knees had tibial slope that fell within reference range, whereas 53.7% fell within range for fixed bearing group ( p < 0.001). Femorotibial rotational mismatch of more than 10° was noted in 13.8% in Oxford group and 20.5% in fixed bearing group ( p = 0.04). Conclusion In conclusion, Microplasty instrumentation for Oxford mobile bearing unicompartmental knee arthroplasty is more accurate and precise compared to conventional fixed bearing unicompartmental knee arthroplasty in sagittal, coronal, and axial alignment. Prospective studies with long-term follow-up are warranted to investigate the clinical implications.

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Experimental testing of total knee replacements with UHMW-PE inserts: impact of severe wear test conditions

Zietz

Reinders

Schwiesau³

et al. 2015

J Mater Sci: Mater Med

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Aseptic implant loosening due to inflammatory reactions to wear debris is the main reason for the revision of total knee replacements (TKR). Hence, the decrease in polyethylene wear particle generation from the articulating surfaces is aimed at improving implant design and material. For preclinical testing of new TKR systems standardized wear tests are required. However, these wear tests do not reproduce the entire in vivo situation, since the pattern and amount of wear and subsequent implant failure are underestimated. Therefore, daily activity, kinematics, implant aging and position, third-body-wear and surface properties have to be considered to estimate the wear of implant components in vivo. Hence, severe test conditions are in demand for a better reproduction of the in vivo situation of TKR. In the present article an overview of different experimental wear test scenarios considering clinically relevant polyethylene wear situations using severe test conditions is presented.

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Reduziert ein erhöhter tibialer Slope den Abrieb bei unikondylären Schlittenprothesen?

Cited by 4 publications

References 21 publications

Improved accuracy in computer-assisted unicondylar knee arthroplasty: a meta-analysis

Improved accuracy in computer-assisted unicondylar knee arthroplasty: a meta-analysis

Can accuracy of component alignment be improved with Oxford UKA Microplasty® instrumentation?

Experimental testing of total knee replacements with UHMW-PE inserts: impact of severe wear test conditions

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