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Ann Rheum Dis. 2013 Jun;72(6):918-23. doi: 10.1136/annrheumdis-2012-201643. Epub 2012 Jun 23.

Cam impingement causes osteoarthritis of the hip: a nationwide prospective cohort study (CHECK).

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  • 1Department of Orthopaedics, Erasmus MC University Medical Centre, Rotterdam, The Netherlands. r.agricola@erasmusmc.nl

Abstract

OBJECTIVE:

To determine the association between cam impingement, which is hip incongruity by a non-spherical femoral head and development of osteoarthritis.

METHODS:

A nationwide prospective cohort study of 1002 early symptomatic osteoarthritis patients (CHECK), of which standardised anteroposterior pelvic radiographs were obtained at baseline and at 2 and 5 years follow-up. Asphericity of the femoral head was measured by the α angle. Clinically, decreased internal hip rotation (≤20°) is suggestive of cam impingement. The strength of association between those parameters at baseline and development of incident osteoarthritis (K&L grade  2) or end-stage osteoarthritis (K&L grades 3, 4, or total hip replacement) within 5 years was expressed in OR using generalised estimating equations.

RESULTS:

At baseline, 76% of the included hips had no radiographic signs of osteoarthritis and 24% doubtful osteoarthritis. Within 5 years, 2.76% developed end-stage osteoarthritis. A moderate (α angle>60°) and severe (α angle>83°) cam-type deformity resulted in adjusted OR of 3.67 (95% CI 1.68 to 8.01) and 9.66 (95% CI 4.72 to 19.78), respectively, for end-stage osteoarthritis. The combination of severe cam-type deformity and decreased internal rotation at baseline resulted in an even more pronounced adjusted OR, and in a positive predictive value of 52.6% for end-stage osteoarthritis. For incident osteoarthritis, only a moderate cam-type deformity was predictive OR=2.42 (95% CI 1.15 to 5.06).

CONCLUSIONS:

Individuals with both severe cam-type deformity and reduced internal rotation are strongly predisposed to fast progression to end-stage osteoarthritis. As cam impingement might be a modifiable risk factor, early recognition of this condition is important.

PMID:
22730371
[PubMed - indexed for MEDLINE]
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