Table 3. Comparisons of the pooled mean changes in muscle strength between quadriceps and hamstring muscles at postoperative 3 and 6 months, and 1 year relative to preoperative levels.

	Quadriceps		Hamstring
	Mean	SD	Mean	SD	P-value
Preop. to 3 months.	-9.2	21.97	-4.9	17.44	0.041
Preop. to 6 months	0.14	27.5	-0.86	19.29	0.632
Preop. to 1 year	0.66	12.4	1.22	3.7	0.548