Odds ratio (OR) and 95% confidence intervals (CI) for factors associated with grade 2 or 3 osteophyte at each site: multivariate analysis
| Site of grade 2 or 3 osteophyte | Associated factor | OR | 95% CI |
|---|---|---|---|
| TFJ, tibiofemoral joint; PFJ, patellofemoral joint; JSN, joint space narrowing; Sum osteophyte score, summated osteophyte score for other three compartments (that is, total osteophyte score – osteophyte score for compartment of interest). | |||
| *Continuous variable; †dichotomised at 0–1 v 2–3; ‡dichotomised at 0–8 v 9–18. | |||
| Lateral femoral osteophyte | Attrition of TFJ | 4.24 | 1.38 to 13.0 |
| Chondrocalcinosis | 5.10 | 1.64 to 15.9 | |
| Lateral tibial osteophyte | Female | 8.52 | 1.57 to 46.3 |
| Attrition of TFJ | 5.21 | 1.69 to 16.1 | |
| Chondrocalcinosis | 6.55 | 2.09 to 20.5 | |
| Medial femoral osteophyte | Female | 5.09 | 1.14 to 22.8 |
| Attrition of TFJ | 23.0 | 7.03 to 75.0 | |
| Femorotibial angle* | 1.13 | 1.04 to 1.23 | |
| Sum osteophyte score‡ | 11.6 | 1.96 to 68.6 | |
| Medial tibial osteophyte | Age | 1.16 | 1.03 to 1.19 |
| Chondrocalcinosis | 6.68 | 1.40 to 31.8 | |
| Femorotibial angle* | 1.27 | 1.08 to 1.48 | |
| Lateral patellar osteophyte | Body mass index | 1.10 | 1.02 to 1.19 |
| Attrition of PFJ | 17.6 | 5.38 to 57.7 | |
| Patellar lateral subluxation† | 11.8 | 3.85 to 36.4 | |
| Lateral trochlear osteophyte | Femorotibial angle* | 0.90 | 0.83 to 0.98 |
| Patellar lateral subluxation† | 3.69 | 1.27 to 10.7 | |
| JSN of lateral PFJ† | 3.19 | 1.05 to 9.69 | |
| Medial patellar osteophyte | Femorotibial angle* | 1.70 | 1.22 to 2.36 |
| Medial trochlear osteophyte | Body mass index* | 1.11 | 1.01 to 1.22 |
| JSN of medial TFJ† | 7.40 | 1.50 to 36.4 | |
| Sum osteophyte score‡ | 7.28 | 1.85 to 28.7 | |