Background Better muscular recovery of the extensor mechanism after TKA is claimed by femoral designs based on a sagittal single radius. Questions/purposes We aimed to compare postoperative knee performance through the Knee Society scores, flexor and extensor muscle function, stability, and gait of a series of patients receiving a posterior stabilized, cemented TKA, with a single-radius femoral design. Methods We compared a series of patients treated with a single-radius femoral design TKA to a simultaneous series of patients receiving a multiradius femoral design. Both groups were similar in demographics and preoperative Knee Society scores. The clinical pathways were identical. Outcome assessment included Knee Society scores, isokinetic assessment, stabilometry, and gait cycle analysis.
ResultsWe observed higher functional Knee Society scores (86.6 ± 1.89 versus 80.3 ± 1.90), fewer physiotherapy sessions (19.9 ± 4.65 versus 22.2 ± 3.34), and less time with two crutches (3.5 ± 1.2 versus 5.2 ± 1.04 weeks) for patients receiving the single-radius design. Isokinetic evaluation showed decreased flexion peak torque (40.3 ± 7.9 versus 48.7 ± 9.6), increased extension peak torque (77.2 ± 16.1 versus 69.1 ± 14.4), and lower flexor/ extensor ratio (0.5 ± 0.08 versus 0.7 ± 0
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