Table 1.

Regression equations and p-values of the mixed effects model

Variable	Solutions for the fixed effects using the mixed effect model						p-value
	Intercept	cos FA	cos 2 FA	cos 3 FA	Flexion/ extension	Natural/ TKA	Natural/ TKA
Quadriceps load	52.88	−7.51	+0.23	−0.0011	+118.91	+3.79	0.28
Tibial rotation	−1.00	+0.067	−0.0011	+4.75e-6	−0.38	+2.66	0.001
Peak pressure	0.89	−0.058	0.0018	−8.83e-6	+0.45	+2.66	0.004
Peak pressure (ridge)	0.99	+0.063	0.0021	−0.00001	+0.48	−0.61	0.0001
Peak pressure (medial)	−0.10	−0.015	+0.00089	−4.00e-6	+0.27	−1.24	0.064
Peak pressure (lateral)	0.42	−0.032	+0.0011	−5.09e-6	+0.30	−0.16	0.011
Contact area	285.99	−0.30	+0.0097	-0.00014	+7.36	−0.14	<0.0001
Proximalization	8.55	+0.31	−0.0058	+ 0.000019	+2.51	+3.58	<0.0001