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In recent years, abnormal hip joint morphology has emerged as a significant factor responsible for the onset of hip osteoarthritis (OA). This is believed to lead to pathological loading patterns that produce shear stresses on the hip joint over time.1 Ganz et al 2 described two different morphological patterns of femoroacetabular impingement (FAI): cam and pincer FAI.
What is the prevalence of FAI morphology in the general population? Estimates vary wildly owing to disparity in the definition of FAI morphology used and in the populations sampled. The proportion of the population with symptoms related to FAI is only a fraction of those with FAI morphology. Furthermore, the presence of severe morphological abnormalities does not always bring about hip OA, suggesting that there are other factors at play in hip OA pathogenesis than just joint morphology.
The need for consensus
This recently defined clinical problem of FAI with widely disparate definitions available and controversy about management motivated the need for some consensus. This international consensus (see page 1169) provides a broad overview of important questions in this challenging field …
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