Table 2. Change in knee extensor muscle strength and single-leg hop function.

Main outcome measurement	PEG (n=40)	NPEG (n=40)
Knee extensor 60°/sec deficit (%)
Preop	22.8±13.7	23.5±15.8
Post-op	28.5±9.0*	36.5±10.7
Knee extensor 180°/sec deficit (%)
Preop	16.6±10.6	17.5±11.9
Post-op	23.3±9.0*	27.9±12.6
Single-leg hop LSI (%)
Preop	75.1±10.3	76.5±8.9
Post-op	85.3±7.4*	80.5±9.6

Date represent the mean±SD. PEG: preop exercise group; NPEG: no pre-op exercise group. *p<0.05