Cam morphology is strongly and consistently associated with development of radiographic hip osteoarthritis throughout 4 follow-up visits within 10 years

Review written by Dr Michael Reiman info

Key Points

  1. The risk ratio of developing osteoarthritis (OA) with an alpha angle ranging from >60° to >78° is 14% to 69% within a 10-year time frame in subjects with hip, knee, or both hip and knee pain.
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Femoroacetabular impingement (FAI) is described as a pathologic contact between the femur and the acetabulum due to incongruity between the shape of the proximal femur and the acetabulum (1,2). Ganz et al. proposed FAI as a mechanism for developing early osteoarthritis (OA) (3), but this was based on his clinical experience of more than 600 hip surgical dislocations. Biomechanical and prospective studies have also suggested Cam FAI morphology as a risk factor in the development of OA (4,5).

This study aimed to determine the association between cam morphology and the development of radiographic hip osteoarthritis at four time points within a 10-year follow-up.

FAI has been proposed as a mechanism for developing early osteoarthritis.
The consideration on whether or not to have osteoplasty surgery for cam femoroacetabular impingement requires consideration of multiple variables.


  • The study utilized a nationwide prospective Cohort Hip and Cohort Knee (CHECK) study that included 1002 participants aged 45–65 with up to 10-year follow-ups. Individuals were excluded from the study if they had other pathological conditions that could explain the
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