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The prevalence of cam hip morphology in a general population sample

E J Dickenson1, P D H Wall1, C E Hutchinson1

  • 1University of Warwick, Coventry, CV4 7AL, UK; University Hospitals of Coventry and Warwickshire NHS Trust, Coventry, CV2 2DX, UK.

Osteoarthritis and Cartilage
|December 4, 2018
PubMed

Insights

Nearly half of the UK general population has cam hip morphology, a condition linked to femoroacetabular impingement syndrome and osteoarthritis. This study assessed its prevalence using computed tomography scans.

Area of Science:

  • Orthopedics
  • Radiology
  • Epidemiology

Background:

  • Cam hip morphology is a known risk factor for femoroacetabular impingement (FAI) syndrome and hip osteoarthritis (OA).
  • Understanding the prevalence of cam morphology in the general population is crucial for public health and clinical risk assessment.

Purpose of the Study:

  • To determine the prevalence of cam hip morphology in a sample representative of the UK general population.
  • To utilize a validated measure with predefined diagnostic accuracy for assessing cam morphology.

Main Methods:

  • Retrospective screening of 200 patients (aged 16-65) who underwent computed tomography (CT) pelvis scans at a major trauma center.
  • Exclusion of subjects with pelvic fractures or those deceased. Subjects were grouped by gender and age, with 20 per group.
  • Measurement of alpha angles (a proxy for cam morphology) on CT imaging, with an alpha angle >60° defining cam morphology. The measure has 80% sensitivity and 73% specificity.

Main Results:

  • Cam morphology was identified in 47% of the 200 subjects (95% CI 42, 51).
  • The study sample was broadly representative of the UK general population regarding the index of multiple deprivation (IMD).
  • The majority of subjects (86%) identified as white.

Conclusions:

  • A significant proportion, 47%, of the UK general population sample exhibited cam hip morphology.
  • This finding highlights the widespread presence of a hip shape associated with debilitating conditions like FAI syndrome and OA.
Abstract

Keywords:
Cam morphologyFemoroacetabular impingementOsteoarthritisPrevalence

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