Table 4.
Regression coefficients for BMI and the proportion of variance in each model for cMFTC and cLFTC for tertiles and quintiles of FTA*
| Model R2, % | β (95% CI) | P | |
|---|---|---|---|
| FTA tertiles | |||
| cMFTC | |||
| Neutral (± 0–2°) | 9.1 | −1.6 (−4.8, 1.6) | 0.314 |
| Minor malalignment (± 2–3.5°) | 13.3 | −7.7 (−13.2, −2.2) | 0.006 |
| Definite malalignment (± ≥3.5°) | 14.2 | −4.6 (−10.9, 1.7) | 0.149 |
| cLFTC | |||
| Neutral (± 0–2°) | 9.8 | 1.3 (−1.7, 4.3) | 0.398 |
| Minor malalignment (± 2–3.5°) | 1.0 | −2.2 (−6.6, 2.3) | 0.345 |
| Definite malalignment (± ≥3.5°) | 9.6 | 1.7 (−3.1, 6.5) | 0.486 |
| FTA quintiles | |||
| cMFTC | |||
| Definite varus (≤ −3.5°) | 13.6 | −3.6 (−11.2, 4.0) | 0.352 |
| Minor varus (−3.5 to −2°) | 16.2 | −8.4 (−15.5, −1.3) | 0.021 |
| Neutral (± 0–2°) | 9.1 | −1.6 (−4.8, 1.5) | 0.314 |
| cLFTC | |||
| Definite valgus (≥3.5°) | 12.6 | 2.6 (−11.1, 16.3) | 0.706 |
| Minor valgus (2–3.5°) | 6.4 | −6.1 (−17.9, 5.6) | 0.295 |
| Neutral (± 0–2°) | 9.8 | 1.3 (−1.7, 4.3) | 0.398 |
*
Negative beta coefficients indicate cartilage thinning per unit increase in BMI. Positive beta coefficients indicate cartilage thickening per unit increase in BMI. BMI = body mass index; cMFTC = central weight-bearing medial femorotibial compartment; cLFTC = central weight-bearing lateral femorotibial compartment; FTA = femorotibial angle; 95% CI = 95% confidence interval.