. Author manuscript; available in PMC: 2012 Oct 1.

Published in final edited form as: Arthritis Care Res (Hoboken). 2011 Oct;63(10):1391–1397. doi: 10.1002/acr.20528

Table 3.

The association between quadriceps strength and patellofemoral joint (PFJ) cartilage damage and bone marrow lesions.

	Tertile 1 (Strong)	Tertile 2	Tertile 3 (Weak)	p trend
Quadriceps Strength Range
Male	1.45–2.73	1.06–1.44	0.10–1.05
Female	0.95–2.09	0.67–0.94	0.05–0.66
# of knees	268	268	271
*Lateral PFJ*
Cartilage Damage
WORMS ≥2 n/N (%)	159/536 (30)	219/536 (41)	237/542 (44)	0.0007
Adjusted PD (%)^* (95% CI)	0 (reference)	8.5 (1.6–15.3)	10.2 (2.8–17.6)	0.0007
Bone Marrow Lesions
WORMS ≥1 n/N (%)	88/536 (16)	128/536 (24)	136/542 (25)	0.003
Adjusted PD (%)^* (95% CI)	0 (reference)	6.2 (0.6–11.7)	7.1 (1.3–12.8)	0.003
*Medial PFJ*
Cartilage Damage
WORMS ≥2 n/N (%)	217/536 (40)	280/536 (52)	299/542 (55)	0.003
Adjusted PD (%)^* (95% CI)	0 (reference)	8.1 (1.5–4.7)	9.1 (1.9–16.4)	0.003
Bone Marrow Lesions
WORMS ≥1 n/N (%)	101/536 (19)	112/536 (21)	104/542 (19)	0.31
Adjusted PD (%)^* (95% CI)	0 (reference)	−0.1 (−5.2–5.0)	−2.3 (−7.7–3.2)	0.31

PD=prevalence difference, adjusted forage, sex, and BMI