Table III.
The best fitting models, found using multilevel regression analysis, are presented for all translations and rotations (x, y, and z) and total translation and total rotation, for both the femur and tibia components separately.
| Component | Effect (95% CI) | p-value | Effect (95% CI) | p-value | Effect (95% CI) | p-value | Effect (95% CI) | p-value |
|---|---|---|---|---|---|---|---|---|
| Femur, translation | Tx | Ty | Tz | TT | ||||
| Intercept | -0.07 (-0.39 to 0.26) | 0.683 | 0.03 (-0.10 to 0.17) | 0.619 | 0.32 (-0.20 to 0.83) | 0.229 | 0.35 (-0.06 to 0.76) | 0.094 |
| Group (1 = BCR; 2 = CR) | 0.03 (-0.17 to 0.23) | 0.770 | -0.02 (-0.10 to 0.06) | 0.647 | -0.12 (-0.43 to 0.20) | 0.459 | -0.10 (-0.35 to 0.16) | 0.455 |
| Time | -0.02 (-0.03 to 0.00) | 0.081 | 0.02 (0.01 to 0.03) | 0.002 | 0.02 (-0.01 to 0.05) | 0.193 | 0.08 (0.05 to 0.10) | < 0.000 |
| Femur, rotation | Rx | Ry | Rz | TR | ||||
| Intercept | -0.11 (-0.70 to 0.47) | 0.703 | 0.52 (0.07 to 0.98) | 0.024 | 0.18 (-0.10 to 0.47) | 0.209 | 0.39 (-0.08 to 0.86) | 0.105 |
| Group (1 = BCR; 2 = CR) | 0.01 (-0.35 to 0.37) | 0.961 | -0.34 (-0.61 to -0.06) | 0.018 | -0.11 (-0.29 to 0.06) | 0.200 | -0.07 (-0.36 to 0.21) | 0.617 |
| Time | -0.08 (-0.18 to 0.02) | 0.106 | -0.04 (-0.12 to 0.04) | 0.288 | -0.05 (-0.09 to 0.00) | 0.061 | 0.07 (0.04 to 0.09) | < 0.000 |
| Group × Time | 0.06 (0.00 to 0.13) | 0.040 | 0.04 (-0.00 to 0.09) | 0.066 | 0.03 (0.00 to 0.06) | 0.048 | Not in this model | |
| Tibia, translation | Tx | Ty | Tz | TT | ||||
| Intercept | 0.22 (-0.00 to 0.45) | 0.051 | -0.01 (-0.33 to 0.31) | 0.950 | 0.10 (-0.27 to 0.47) | 0.588 | -0.06 (-0.36 to 0.24) | 0.695 |
| Group (1 = BCR; 2 = CR) | -0.14 (-0.28 to -0.00) | 0.049 | 0.02 (-0.18 to 0.22) | 0.878 | -0.05 (-0.28 to 0.18) | 0.683 | 0.15 (-0.03 to 0.34) | 0.107 |
| Time | -0.01 (-0.05 to 0.03) | 0.544 | -0.07 (-0.12 to -0.03) | 0.001 | -0.06 (-0.11 to -0.01) | 0.020 | 0.12 (0.07 to 0.17) | < 0.001 |
| Group × Time | 0.01 (-0.02 to 0.03) | 0.497 | 0.05 (0.02 to 0.08) | < 0.001 | 0.05 (0.02 to 0.09) | 0.001 | -0.04 (-0.07 to -0.00) | 0.026 |
| Tibia, rotation | Rx | Ry | Rz | TR | ||||
| Intercept | 0.24 (-0.57 to 1.00) | 0.540 | -0.37 (-0.91 to 0.17) | 0.177 | 0.20 (-0.16 to 0.55) | 0.273 | -0.17 (-0.79 to 0.44) | 0.577 |
| Group (1 = BCR; 2 = CR) | -0.07 (-0.55 to 0.40) | 0.766 | 0.28 (-0.06 to 0.62) | 0.103 | -0.04 (-0.26 to 0.18) | 0.725 | 0.28 (-0.10 to 0.67) | 0.144 |
| Time | -0.35 (-0.47 to -0.23) | < 0.001 | 0.16 (0.07 to 0.24) | < 0.001 | -0.16 (-0.23 to -0.10) | < 0.001 | 0.33 (0.21 to 0.44) | < 0.001 |
| Group × Time | 0.19 (0.12 to 0.27) | < 0.001 | (-0.17 to -0.07) | < 0.001 | 0.07 (0.03 to 0.11) | 0.001 | -0.13 (-0.20 to -0.06) | < 0.001 |
All effects and corresponding 95% CIs are presented and the reported p-values were obtained from chi-squared tests to test the goodness of fit of the models. An example regression equation would be, for rotation around the x-axis, Rx = -0.11 + 0.01 Group – 0.08 × Time + 0.06 × (Group × Time).
BCR, bicruciate-retaining; CI, confidence interval.