Table 1.

Kinetic validation of the tibiofemoral joint. Quantitative analysis of the predicted medial, lateral, and total tibiofemoral contact forces with reference to in vivo measurements during the two-leg squat motion cycle as reported by Fregly et al. [57]. Units are expressed in Newton (N) and body weight (xBW). Mean absolute deviation (MAD), root-mean-square error (RMSE), Pearson correlation coefficient ($r^2$), and coefficient of determination ($R^2$).

Value	MAD [N]	MAD [xBW]	RMSE [N]	RMSE [xBW]	${\mathit{r}}^2$	${\mathit{R}}^2$
Total knee contact force	209.68	0.32	255.19	0.39	0.97	0.94
Medial contact force	163.02	0.25	226.65	0.35	0.94	0.89
Lateral contact force	46.67	0.07	68.28	0.10	0.95	0.91