Table III.

IKDC scores before and after surgery in the two groups (x̄±s, score).

Group (n)	Before surgery	12 months after surgery	24 months after surgery
Observation (31)	64.2±6.3	83.5±3.7	85.1±4.2
Control (37)	66.2±5.6	83.0±3.5	85.9±4.0
F time point, P		255.412, <0.001
F time point × group, P		0.057,0.848
F group, P		0.019,0.890