Table 3

Physical performance tests as predictors of self-reported knee function at 2 and 5 years

	Crude analysis				Adjusted analysis
Predictor	Slope	95% CI	R²	p Value	Slope	95% CI	R²	p Value
KOOS₄ at 2 years
Quadriceps LSI (%)	0.39	−0.13 to 0.91	0.03	0.14	–	–	–	–
Hamstrings LSI (%)	0.10	−0.30 to 0.50	0.004	0.63	–	–	–	–
One-leg hop LSI (%)	0.24	−0.32 to 0.79	0.009	0.40	–	–	–	–
Square-hop LSI (%)	0.11	−0.25 to 0.47	0.005	0.55	–	–	–	–
Vertical hop LSI (%)	0.15	−0.13 to 0.43	0.03	0.28	–	–	–	–
One-leg balance LSI (%)	−0.01	−0.08 to 0.06	0.002	0.72	–	–	–	–
One-leg rise LSI (%)	1.32	0.68 to 1.97	0.18	<0.001	1.12	0.46 to 1.79	0.25	0.001
Test battery (LSI≥90% in all 4 tests)*	6.78	−3.44 to 17.0	0.024	0.19	–	–	–	–
KOOS₄ at 5 years
Quadriceps LSI (%)	0.40	−0.02 to 0.81	0.05	0.06	0.35	−0.08 to 0.79	0.11	0.11
Hamstrings LSI (%)	0.11	−0.25 to 0.47	0.007	0.55	–	–	–	–
One-leg hop LSI (%)	0.14	−0.30 to 0.59	0.005	0.52	–	–	–	–
Square-hop LSI (%)	0.12	−0.18 to 0.41	0.008	0.42	–	–	–	–
Vertical hop LSI (%)	−0.09	−0.34 to 0.16	0.01	0.48	–	–	–	–
One-leg balance LSI (%)	0.004	−0.05 to 0.06	0.00	0.88	–	–	–	–
One-leg rise LSI (%)	1.04	0.52 to 1.55	0.17	<0.001	0.88	0.34 to 1.42	0.24	0.002
Test battery (LSI≥90% in all 4 tests)*	0.81	−7.43 to 9.04	0.001	0.85	–	–	–	–

Univariate regression analyses were performed for crude results; multivariate regression analysis was employed for the adjusted analysis with a model including one-leg rise LSI, sex, age, BMI, surgery/no surgery and baseline KOOS₄ scores.
*Tests included were one-leg hop, square-hop, one-leg balance and one-leg rise tests.
BMI, body mass index; LSI, leg symmetry index (injured leg divided by non-injured leg×100).