Odds ratio (OR) and 95% confidence intervals (CI) for factors associated with grade 1 or more osteophyte at each site: multivariate analysis
| Site of grade 1 or more osteophyte | Associated factor | OR | 95% CI |
|---|---|---|---|
| TFJ, tibiofemoral joint; PFJ, patellofemoral joint; JSN, joint space narrowing. | |||
| *Continuous variable; †dichotomised at 0–1 v 2–3. | |||
| Lateral femoral osteophyte | Attrition of PFJ | 10.1 | 3.60 to 28.2 |
| Chondrocalcinosis | 4.38 | 1.45 to 13.2 | |
| JSN of lateral TFJ† | 4.97 | 1.21 to 20.3 | |
| Lateral tibial osteophyte | Attrition of PFJ | 3.22 | 1.03 to 10.0 |
| Chondrocalcinosis | 28.6 | 3.69 to 221.9 | |
| JSN of medial TFJ† | 2.33 | 1.01 to 5.34 | |
| JSN of lateral PFJ† | 2.97 | 1.18 to 7.50 | |
| Medial femoral osteophyte | Female | 3.06 | 1.22 to 7.70 |
| Patellar lateral subluxation† | 9.13 | 2.50 to 33.4 | |
| JSN of medial TFJ† | 6.36 | 2.57 to 15.7 | |
| Medial tibial osteophyte | Attrition of TFJ | 7.65 | 1.89 to 31.0 |
| JSN of medial TFJ† | 4.25 | 1.54 to 11.7 | |
| Lateral patellar osteophyte | Body mass index* | 1.13 | 1.05 to 1.22 |
| Attrition of PFJ | 6.49 | 1.90 to 22.1 | |
| Chondrocalcinosis | 2.77 | 1.09 to 7.04 | |
| Patellar lateral subluxation† | 5.61 | 1.59 to 19.8 | |
| Lateral trochlear osteophyte | Attrition of PFJ | 9.10 | 2.23 to 37.1 |
| Chondrocalcinosis | 4.71 | 1.85 to 12.0 | |
| Patellar lateral subluxation† | 10.8 | 2.79 to 41.7 | |
| Patellar medial subluxation | 0.14 | 0.04 to 0.57 | |
| Medial patellar osteophyte | JSN of medial PFJ† | 2.65 | 1.07 to 6.56 |
| Medial trochlear osteophyte | JSN of medial TFJ† | 2.53 | 1.30 to 4.92 |