Table 3.

Cross-sectional Association of Asymmetric Radiographic Hip OA (RHOA) with Baseline Knee Pain and Knee Joint Space Narrowing (JSN) in the Contralateral vs. Ipsilateral Knee.

Outcome	RRR* (95% CI) [p-value] for outcome in the Contralateral vs. Ipsilateral Knee**
WOMAC Knee Pain	Unadjusted	Adjusted for hip pain and knee K-L Grade
Mild vs. No Pain	1.28 (0.98, 1.67) [0.06]	1.28 (0.98, 1.67) [0.07]
Severe vs. No Pain	1.12 (0.90, 1.40) [0.28]	1.15 (0.89, 1.48) [0.26]
Knee JSN	Unadjusted	Adjusted for hip pain
Mild (1) vs. No JSN (0)	1.02 (0.82, 1.26) [0.86]	1.03 (0.82, 1.27) [0.82]
Moderate [52] vs. No JSN (0)	1.27 (0.95, 1.68) [0.11]	1.27 (0.95, 1.68) [0.10]

^*Relative risk ratios [32] and 95% confidence intervals (CI) estimated from clustered multinomial regression models.

^**An individual’s contralateral and ipsilateral knees are identified in relation to the limb with more severe RHOA.