Results of logistic regression analysis of risk factors for radiographic patellofemoral osteoarthritis, in mixed or isolated osteoarthritis pattern, in the meniscectomised knee (317 patients of whom 66 developed patellofemoral osteoarthritis)
| Risk factor | Prevalence of patellofemoral osteoarthritis (n (%)) | Crude OR | Adjusted OR | 95% CI* | ||||
|---|---|---|---|---|---|---|---|---|
| *Adjusted simultaneously for all other risk factors listed. | ||||||||
| †Reference category. | ||||||||
| CI, confidence interval; OR, odds ratio. | ||||||||
| Age at follow up (years) | ||||||||
| <50† | 19/121 (16) | 1.0 | 1.0 | |||||
| 50 to 59 | 19/98 (19) | 1.3 | 1.5 | 0.7 to 3.1 | ||||
| ⩾60 | 28/98 (29) | 2.1 | 2.2 | 1.1 to 4.5 | ||||
| Sex | ||||||||
| Men† | 50/251 (20) | 1.0 | 1.0 | |||||
| Women | 16/66 (24) | 1.3 | 1.1 | 0.6 to 2.4 | ||||
| Body mass index (kg/m2) | ||||||||
| <25.0† | 23/126 (18) | 1.0 | 1.0 | |||||
| 25.0–29.9 | 29/153 (19) | 1.0 | 1.0 | 0.5 to 2.0 | ||||
| ⩾30.0 | 14/38 (37) | 2.6 | 2.8 | 1.2 to 6.4 | ||||
| Localisation (compartment) | ||||||||
| Medial† | 48/250 (19) | 1.0 | 1.0 | |||||
| Lateral | 18/67 (27) | 1.5 | 2.2 | 1.1 to 4.5 | ||||
| Type of resection | ||||||||
| Partial† | 13/63 (21) | 1.0 | 1.0 | |||||
| Subtotal | 22/99 (22) | 1.1 | 1.6 | 0.7 to 3.8 | ||||
| Total | 31/155 (20) | 1.0 | 1.2 | 0.5 to 2.5 | ||||
| Type of meniscal tear | ||||||||
| Longitudinal† | 23/139 (17) | 1.0 | 1.0 | |||||
| Degenerative | 31/120 (26) | 1.8 | 1.8 | 0.9 to 3.5 | ||||
| Radial | 5/24 (22) | 1.3 | 1.0 | 0.3 to 3.3 | ||||
| No visible tear or not classified | 7/34 (21) | 1.3 | 1.5 | 0.5 to 4.0 | ||||