Table 3.
Association between patella alignment (fore groups) and adjusted means of medial PF joint space narrowing
| Measure | Medial joint space narrowing | p for trend | ||||
| Quartile... | 1 | 2 | 3 | 4 | ||
| PLR | No. of knees | 50 | 50 | 50 | 52 | |
| Range of PLR | 0.66–0.87 | 0.88–0.98 | 0.98–1.12 | 1.13–1.71 | ||
| OR (95% CI) | 1.00 | 1.97 (0.65–5.99) | 2.09 (0.70–6.19) | 2.47 (0.86–7.14) | Linear, 0.1253 | |
| SA | No. of knees | 51 | 52 | 49 | 50 | |
| Range of SA | 98–113 | 114–119 | 120–124 | 125–155 | ||
| OR (95% CI) | 1.00 | 1.37 (0.47–3.98) | 1.66 (0.57–4.87) | 3.17 (1.15–8.72) | Linear, 0.0162 | |
| LPTA | No. of knees | 52 | 52 | 44 | 54 | |
| Range of LPTA | -25 to 13 | 14–17 | 18–21 | 22–35 | ||
| OR (95% CI) | 1.00 | 1.532 (0.546–4.302) | 1.697 (0.603–4.773) | 2.185 (0.822–5.809) | Linear, 0.0259 | |
| BO | No. of knees | 49 | 49 | 51 | 50 | |
| Range of BO | 38.46–54.55 | 54.76–60.42 | 60.47–66.67 | 66.67–100 | ||
| OR (95% CI) | 1.00 | 0.887 (0.346–2.272) | 0.711 (0.272–1.857) | 0.189 (0.057–0.638) | Linear, 0.0026 | |
Results are adjusted for age, sex and bone mass index. PLR, patellar length ratio; SA, sulcus angle; LPTA, lateral patellar tilt angle; BO, bisect offset; OR, odds ratio; CI, confidence interval.