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, 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.
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, 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.
Authors: David T Felson; Michael C Nevitt; Mei Yang; Margaret Clancy; Jingbo Niu; James C Torner; C Elizabeth Lewis; Piran Aliabadi; Burton Sack; Charles McCulloch; Yuqing Zhang Journal: J Rheumatol Date: 2008-09-15 Impact factor: 4.666
Authors: Chan Kim; Michael Nevitt; Ali Guermazi; Jingbo Niu; Margaret Clancy; Irina Tolstykh; Pia M Jungmann; Nancy E Lane; Neil A Segal; William F Harvey; Cora E Lewis; David T Felson Journal: Arthritis Rheumatol Date: 2018-10 Impact factor: 10.995
Authors: Martin Englund; David T Felson; Ali Guermazi; Frank W Roemer; Ke Wang; Michel D Crema; John A Lynch; Leena Sharma; Neil A Segal; Cora E Lewis; Michael C Nevitt Journal: Ann Rheum Dis Date: 2011-06-06 Impact factor: 19.103
Authors: Ahmed A Khalifa; Arun B Mullaji; Abanoub Nagaty Gendy; Ahmed M Ahmed; Hatem M Bakr; Yaser E Khalifa; Ahmed M Abdelaal Journal: Eur J Orthop Surg Traumatol Date: 2021-01-09