O2242 COMPARISON OF ISOKINETIC STRENGTH IN BILATERAL TKA WITH AND WITHOUT PATELLA RESURFACING

Abstract

Aims: The purpose of this study was to objectively evaluate isokinetic strength, clinical, and radiographical outcome of 22 patients with bilateral TKA using the same prosthesis with and without patella resurfacing. Methods: Bilateral TKA, one with, one without patella resurfacing was performed in 22 osteoarthritic patients, mean age was 68 years (58 to 79) using the Low-Contact-Stress prosthesis. Minimum Follow-up was one year at time of investigation. Evaluation included clinical investigation, speciþc patella scores, radiographic analysis and isokinetic strength measurement of both knee ßexion and extension at 60 degrees per second (Biodex). Results: There was no signiþcant difference in the clinical scores (mean: 26 out of 30 points), but mean iso-kinetic strength of knee extension was signiþcantly stronger (p< 0.0001) in the non-resurfaced TKA (40.5 Nm) compared with the resurfaced TKA (38,5 Nm). Flexion was also signiþcantly stronger in the patella non-resurfaced group with 22.4 Nm versus 19.5 Nm in the resurfaced group. Mean lateral deviation was significantly (p< 0.001) less optimal in the resurfaced group as was postoperative patello-femoral congruent contact (p< 0.001). However, there was no correlation between lateral patella deviation or congruent contact and iso-kinetic strength. Conclusions: The results of this prospective and randomized study indicate that mean isokinetic strength of both knee ßexion and extension was signiþcantly stronger in the non-resurfaced TKA. This study provides encouraging data for patella non-resurfacing.