Table 4.
Relationship between parameters of patellofemoral geometry and WOMAC pain and patella cartilage volume: the difference between obese and non-obese subjects
| Obese subgroup | Non-obese subgroup | ||||
|---|---|---|---|---|---|
| Regression coefficient (95% CI)* |
P value | Regression coefficient (95% CI)* |
P value | P value for difference† | |
| WOMAC pain score | |||||
| LCPA | -3.13 (-5.60, -0.67) |
0.01 | 0.56 (-0.63, 1.75) |
0.36 | 0.01 |
| SA | 0.42 (-1.46, 2.29) |
0.66 | -0.1 (-0.79, 0.77) |
0.98 | 0.68 |
| I-S ratio | 87.80 (-30.86, 206.46) |
0.15 | -37.58 (-101.45, 26.29) |
0.25 | 0.06 |
| Medial patella cartilage volume | |||||
| LCPA | 86.36 (26.15, 146.58) |
0.01 | 47.81 (-22.37, 117.99) |
0.18 | 0.41 |
| SA | 12.01 (-35.76, 59.77) |
0.62 | -55.61 (-104.79, -6.43) |
0.03 | 0.05 |
| I-S ratio | -3093.84 (-6260.66, 72.98) |
0.06 | -2943.85 (-6497.61, 603.91) |
0.10 | 0.95 |
| Lateral patella cartilage volume | |||||
| LCPA | 49.36 (-29.20, 127.93) |
0.22 | 48.77 (-52.06, 149.60) |
0.34 | 0.99 |
| SA | 53.63 (-6.93, 114.19) |
0.08 | 31.12 (-44.23, 106.48) |
0.41 | 0.64 |
| I-S ratio | -3594.17 (-75463.31, 357.98) |
0.07 | -2433.12 (-7752.83, 2886.59) |
0.37 | 0.73 |
LCPA = lateral condyle-patella angle, SA = sulcus angle, I-S Ratio = Insall-Salvati Ratio, CI = Confidence Interval
*adjusted for age, gender, BMI, patella cartilage volume and bone size
†p value calculated using independent samples z-test for difference between subgroups