title: Association between cam-type deformities and magnetic resonance imaging-detected structural hip damage: a cross-sectional study in young men.
abstract: OBJECTIVE
  Femoroacetabular impingement may be a risk factor for hip osteoarthritis in men. An underlying hip deformity of the cam type is common in asymptomatic men with nondysplastic hips. This study was undertaken to examine whether hip deformities of the cam type are associated with signs of hip abnormality, including labral lesions and articular cartilage damage, detectable on magnetic resonance imaging (MRI).
  
  
  METHODS
  In this cross-sectional, population-based study in asymptomatic young men, 1,080 subjects underwent clinical examination and completed a self-report questionnaire. Of these subjects, 244 asymptomatic men with a mean age of 19.9 years underwent MRI. All MRIs were read for cam-type deformities, labral lesions, cartilage thickness, and impingement pits. The relationship between cam-type deformities and signs of joint damage were examined using logistic regression models adjusted for age and body mass index. Odds ratios (ORs) and 95% confidence intervals (95% CIs) were determined.
  
  
  RESULTS
  Sixty-seven definite cam-type deformities were detected. These deformities were associated with labral lesions (adjusted OR 2.77 [95% CI 1.31, 5.87]), impingement pits (adjusted OR 2.9 [95% CI 1.43, 5.93]), and labral deformities (adjusted OR 2.45 [95% CI 1.06, 5.66]). The adjusted mean difference in combined anterosuperior femoral and acetabular cartilage thickness was -0.19 mm (95% CI -0.41, 0.02) lower in those with cam-type deformities compared to those without.
  
  
  CONCLUSIONS
  Our findings indicate that the presence of a cam-type deformity is associated with MRI-detected hip damage in asymptomatic young men.
authors: University of Bern and Inselspital, Bern University Hospital, Bern, Switzerland. rbach@ispm.unibe.ch
authors: Stephan
authors: S
authors: Reichenbach
authors: Michael
authors: M
authors: Leunig
authors: Stefan
authors: S
authors: Werlen
authors: Eveline
authors: E
authors: Nüesch
authors: Christian W
authors: CW
authors: Pfirrmann
authors: Harald
authors: H
authors: Bonel
authors: Alex
authors: A
authors: Odermatt
authors: Willy
authors: W
authors: Hofstetter
authors: Reinhold
authors: R
authors: Ganz
authors: Peter
authors: P
authors: Jüni
mesh_terms: D001696:Biomechanical Phenomena; D002358:Cartilage, Articular / Q000473:pathology; D003430:Cross-Sectional Studies; D057925:Femoracetabular Impingement / Q000209:etiology* / Q000473:pathology*; D006615:Hip / Q000002:abnormalities* / Q000473:pathology; D006801:Humans; D016015:Logistic Models; D008279:Magnetic Resonance Imaging; D008297:Male; D015207:Osteoarthritis, Hip / Q000209:etiology* / Q000473:pathology*; D057566:Self Report; D011795:Surveys and Questionnaires; D055815:Young Adult