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Values are presented as mean curves (solid lines) ± standard deviations (SD, shaded areas). Positive values indicate internal rotation. Dotted lines represent the non-OP knee of the TKA group (red) and UKA group (blue). The green rectangle indicates significantly different peak values between the TKA-OP knee and the CG (p = 0.012), the TKA-OP knee and TKA non-OP knee (p = 0.002), the UKA-OP knee and UKA non-OP knee (p = 0.007).
