. 2016 Jun 13;138(8):0810011–08100111. doi: 10.1115/1.4033673

Table 6.

Sensitivity of knee contact force predictions to changes in each type of model parameter values, starting from the Approach A solution (top) and the Approach B solution (bottom). Only one type of parameter was changed at a time, keeping all other types at the values from the original approach. Highlighted rows in gray contain original results obtained from Approach A (top) and Approach B (bottom). Numbers highlighted in bold indicate largest changes from original approach.

Starting from approach A	Quantity	Medial	Lateral	Total
Original approach A solution	R²	0.97	0.88	0.96
RMSE	52.62	56.63	92.80
Changed $l_{o}^{M}$ and $l_{s}^{T}$ scale factors	R²	0.84	−1.02	0.44
RMSE	136.45	239.47	358.78
Changed moment arm deviations	R²	0.61	-0.19	0.78
RMSE	209.48	170.52	222.50
Changed activation scale factors	R²	0.65	0.09	0.86
RMSE	201.15	156.03	174.70
Changed SV weights	R²	0.94	0.78	0.91
RMSE	84.13	76.53	132.77

Starting from approach B	Quantity	Medial	Lateral	Total
Original approach B solution	R²	0.10	−3.43	−0.36
RMSE	322.73	347.78	559.95
Changed $l_{o}^{M}$ and $l_{s}^{T}$ scale factors	R²	0.38	−0.33	0.41
RMSE	260.80	189.92	362.62
Changed moment arm deviations	R²	−0.46	−1.78	−0.08
RMSE	413.12	283.15	499.97
Changed activation scale factors	R²	0.53	−1.53	0.20
RMSE	232.28	267.10	430.10
Changed SV weights	R²	0.45	−3.87	−0.10
RMSE	255.20	363.38	503.18