Table 2. Comparison of functional evaluation results between the two groups.

	10-cm group (n=10)		15-cm group (n=10)		F (time × group)	F (ANCOVA)	p
	Preoperative	Postoperative	Preoperative	Postoperative
	Mean±SD	Mean±SD	Mean±SD	Mean±SD
Berg balance scale (score)	29.8±4.7	32.9±3.6†	33.2±4.4	36.0±4.0†	0.134	-	0.007
Timed Up and Go (sec)	17.6±3.3	15.1±2.4†	16.2±2.0	14.8±1.9†	2.151	-	0.107
Muscle activity
Rectus femoris	35.8±1.0	34.5±1.0	38.8±0.5	40.5±0.8†	-	29.544*	0.115
Biceps femoris	26.2±1.2	27.8±1.0	32.0±1.0	34.9±0.9†	-	16.481*	0.022
Tibialis anterior	16.4±1.0	17.1±1.1	27.3±1.0	29.6±0.8	-	16.716*	0.036
Gastrocnemius	38.5±0.8	44.0±0.8†	49.9±0.9	51.5±0.9	-	3.286	0.255
SD: Standard deviation; Muscle activity (% of maximal voluntary isometric contraction); * Significantly different as controlling for the pretest difference (p<0.05); † Significantly different compared to baseline (p<0.05).