Table 1 Regression equations and p-values of the mixed effects model
From: Patellofemoral contact patterns before and after total knee arthroplasty: an in vitro measurement
Variable | Solutions for the fixed effects using the mixed effect model | p-value | |||||
|---|---|---|---|---|---|---|---|
Intercept | cos FA | cos2FA | cos3FA | 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 |