Table 1.
Among 655 women: relation of quadriceps strength quartiles to worsening cartilage damage in patellofemoral and tibiofemoral subregions*
| Quartile: strength (range)† | Patellofemoral lateral | Patellofemoral medial | Tibiofemoral lateral | Tibiofemoral medial | ||||
|---|---|---|---|---|---|---|---|---|
| Frequency of outcome‡ | Adjusted RR (95% CI)§ | Frequency of outcome‡ | Adjusted RR (95% CI)§ | Frequency of outcome‡ | Adjusted RR (95% CI)§ | Frequency of outcome‡ | Adjusted RR (95% CI) § | |
| 4 (0.07–0.73), weak | 63/285 (22.1) | 1.50 (1.03–2.20) | 53/309 (17.2) | 0.90 (0.62–1.32) | 123/809 (15.2) | 1.09 (0.74–1.59) | 127/794 (16.0) | 1.04 (0.72–1.51) |
| 3 (0.74–0.96) | 57/300 (19.0) | 1.25 (0.85–1.83) | 65/312 (20.8) | 1.07 (0.76–1.52) | 100/829 (12.1) | 0.86 (0.58–1.27) | 153/828 (18.5) | 1.25 (0.89–1.75) |
| 2 (0.97–1.21) | 47/319 (14.7) | 0.91 (0.61–1.38) | 59/316 (18.7) | 0.94 (0.66–1.35) | 104/817 (12.7) | 0.91 (0.63–1.33) | 112/818 (13.7) | 0.94 (0.65–1.36) |
| 1 (1.22–1.90), strong | 46/305 (15.1) | 1.00 (Ref.) | 61/307 (19.9) | 1.00 (Ref.) | 100/806 (12.4) | 1.00 (Ref.) | 116/800 (14.5) | 1.00 (Ref.) |
| P value for trend | – | 0.007 | – | 0.6 | – | 0.9 | – | 0.5 |
*
Values are the number/total (%) unless indicated otherwise. RR = risk ratio; 95% CI = 95% confidence interval; Ref. = reference.
†
Nm/kg.
‡
Denominators may vary based on unreadable subregions, maximal scores at baseline, or missing covariates.
§
Adjusted for age, body mass index, clinic site, knee injury/surgery history, and frontal plane knee alignment.