Table 4.
Least square means (Tukey-adjusted 95% CI) bone-on-bone forces and knee external moments during walking for BMI and alignment, controlling for gender and walking speed. The interaction between BMI and alignment was not statistically significant hence; the main effects of BMI and alignment are reported. Mean body weight = 912 N (93 kg).
| Knee Joint Load |
BMI (kg·m−2) | Alignment | ||||||
|---|---|---|---|---|---|---|---|---|
| 27 – 29.9 Overweight |
30 – 34.9 Class 1 Obese |
35 – 41.3 Class 2+ Obese |
P-value BMI category |
<0° Valgus |
0°–2° Neutral |
>2° Varus |
P-value Alignment |
|
| Compressive Force (N) | 2411 (2182, 2639) | 2772 (2602, 2943) | 2993 (2796, 3190) | 0.0006 | 2734 (2520, 2949) | 2651 (2430, 2871) | 2791 (2634, 2948) | 0.58 |
| Shear Force (N) | 369 (322, 415) | 418 (384, 453) | 472 (432, 513) | 0.004 | 394 (351, 438) | 435 (390, 480) | 429 (397, 461) | 0.33 |
| PF Force (N) | 402 (292, 511) | 459 (378, 540) | 492 (398, 586) | 0.45 | 452 (348, 555) | 410 (305, 515) | 491 (416, 565) | 0.44 |
| Knee Adduction Moment (Nm) | 26.4 (22.6, 30.3) | 30.4 (27.5, 33.3) | 26.6 (23.3, 29.9) | 0.12 | 18.7 (15.1, 22.4) | 27.7 (24.0, 31.4) | 37.0 (34.4, 39.7) | <0.0001 |
| Knee Flexion Moment (Nm) | 33.5 (26.6, 40.4) | 36.7 (31.6, 41.9) | 41.7 (35.8, 47.7) | 0.17 | 35.6 (29.2, 42.1) | 37.1 (30.4, 43.7) | 39.2 (34.5, 43.9) | 0.65 |
Pairwise significant differences:
Compressive force: Overweight vs Class 1, Overweight vs. Class 2+
Shear force: Overweight vs. Class 2+, Class 1 vs. Class 2+
Knee Adduction: All alignment categories were significantly different at a Tukey adjusted 0.05 level.