Table 4

Prevalence of focal knee abnormalities in the incidence and control groups

Lesion

Control group^a (n = 53)

Incidence group^a (n = 92)

Odds ratio^b

95% confidence interval

Cartilage

WORMS >0

33 (73.3%)

59 (67.0%)

0.83

0.36

1.88

WORMS ≥2

19 (42.2%)

44 (50.0%)

1.42

0.66

3.05

Bone marrow lesions

19 (42.2%)

29 (32.9%)

0.64

0.29

1.40

Meniscus

WORMS >0

18 (40.0%)

42 (47.7%)

1.52

0.71

3.30

WORMS ≥2

9 (15.5%)

22 (25.0%)

2.16

0.73

6.35

^aEight subjects from the control group and four subjects from the incidence group did not have whole-organ magnetic resonance imaging score (WORMS) readings available. ^bAll P values were greater than 0.05 using a logistic regression both when unadjusted and when adjusted for age, body mass index, and gender.

Joseph et al. Arthritis Research & Therapy 2011 13:R153   doi:10.1186/ar3469