Table 2.

Comparison of knee joint motion between the two groups ($\overline{x}\pm s$).

Group	N	2 weeks after operation	4 weeks after operation	8 weeks after operation	12 weeks after operation
C group	100	65.82 ± 2.31	78.38 ± 4.31	86.38 ± 4.77	114.69 ± 3.31
R group	100	70.91 ± 4.31	84.94 ± 4.65	98.83 ± 3.45	128.69 ± 5.66
t		10.408	10.346	21.148	21.351
P		<0.01	<0.01	<0.01	<0.01