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Association of leg-length inequality with knee osteoarthritis: A cohort study – Source: Annals of Internal Medicine, Mar 2, 2010

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By William F Harvey, et al. • www.ProHealth.com • April 18, 2010


Background: Leg-length inequality is common in the general population and may accelerate development of knee osteoarthritis.

Objective: To determine whether leg-length inequality is associated with prevalent, incident, and progressive knee osteoarthritis.

Design: Prospective observational cohort study.

Setting: Population samples from Birmingham, Alabama, and Iowa City, Iowa.

Patients: 3026 participants aged 50 to 79 years with or at high risk for knee osteoarthritis.

Measurements: The exposure was leg-length inequality, measured by full-limb radiography. The outcomes were prevalent, incident, and progressive knee osteoarthritis. Radiographic osteoarthritis was defined as Kellgren and Lawrence grade 2 or greater, and symptomatic osteoarthritis was defined as radiographic disease in a consistently painful knee.

Results: Compared with leg-length inequality less than 1 cm, leg-length inequality of 1 cm or more was associated with:

• Prevalent radiographic (53% vs. 36%; odds ratio [OR], 1.9 [95% CI, 1.5 to 2.4]) and symptomatic (30% vs. 17%; OR, 2.0 [CI, 1.6 to 2.6]) osteoarthritis in the shorter leg [Note: an odds ratio of 1.0 would indicate no difference. The OR of 1.9 indicates 90% greater average chance of radiographic evidence of knee OA, and the OR of 2.0 indicates 100% greater odds of OA symptoms on average.]

• Incident symptomatic osteoarthritis in the shorter leg (15% vs. 9%; OR, 1.7 [CI, 1.2 to 2.4]) and the longer leg (13% vs. 9%; OR, 1.5 [CI, 1.0 to 2.1]),

• And increased odds of progressive osteoarthritis in the shorter leg (29% vs. 24%; OR, 1.3 [CI, 1.0 to 1.7]).

Limitations: Duration of follow-up may not be long enough to adequately identify cases of incidence and progression. Measurements of leg length, including radiography, are subject to measurement error, which could result in misclassification.

Conclusion: Radiographic leg-length inequality was associated with prevalent, incident symptomatic, and progressive knee osteoarthritis. Leg-length inequality is a potentially modifiable risk factor for knee osteoarthritis.

Primary Funding Source: National Institute on Aging.

Source: Annals of Internal Medicine, Mar 2, 2010; 152(5):287-95. PMID: 20194234, by Harvey WF, Yang M, Cooke TD, Segal NA, Lane N, Lewis CE, Felson DT. Boston University School of Medicine and Tufts Medical Center, Boston, Massachusetts, USA. [Email: wharvey@tuftsmedicalcenter.org]





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