Table 1.

Initial partial correlations for all clinically-relevant measures and involved peak tibiofemoral contact force while controlling for walking speed. Partial correlations are adjusted for self-selected walking speed. Asterisk (*) denotes significance at the 0.05 level; all probabilities are two-tailed. DF is degrees of freedom.

Category	Independent Variable	Scale	Zero-Order Correlation Coefficient	Partial Correlation
				Coefficient	Sig.	DF
Covariate	Walking Speed	m/s	.522
Performance-Based	Involved Extensor Strength	N/kg*m	.293	.370	.026 *	34
	Time Injury to Testing †	wk	−.069	.120	.485	34
	Log (Time Injury to Testing)	log10 (wk)	−.002	.218	.201	34
Patient-Reported	KOS-ADLS	%	.199	.267	.121	33
	KOS-ADLS Pain	n=0, y=1	−.316	−.247	.153	33
	GRS	%	.263	.512	.002 *	33
	IKDC 2000	%	.270	.252	.164	30
	More than 1 Give-way	n=0, y=1	−.008	.068	.694	34

^†Data were log-transformed for analysis because the distribution exhibited rightward skew.