FEATURE: HIP RELATED PAIN HIP-RELATED PAIN & FEMOROACETABULAR IMPINGEMENT SYNDROME The aim of this systematic review was Conclusion: The prevalence of intra- to determine the prevalence of intra- articular hip pathologies appears articular hip pathologies in individuals highly variable in symptomatic and with and without hip-related symptoms. asymptomatic populations (confidence A comprehensive review of electronic intervals range from 25% to 90%). health databases was undertaken for The prevalence of intra-articular hip studies with a primary aim of pathologies (especially cartilage lesions) investigating the prevalence of imaging appears to be higher in symptomatic defined intra-articular hip pathologies individuals. using commonly used imaging modalities such ass magnetic resonance imaging However, imaging defined intra-articular (MRI) with and with contrast agent and hip pathologies are also consistently computed tomography (CT). PRISMA seen in asymptomatic individuals, guidelines were followed for this13 highlighting a potential discordant process. Twenty-nine studies reporting relationship between imaging on the prevalence of intra-articular hip defined pathology and symptoms. pathologies were identified. The studies were generally of moderate to high risk PART TWO: HOW DOES of bias, with only five of the 29 studies FAI SYNDROME AFFECT adjudged as having low risk of bias. BIOMECHANICS? WITH Fifteen of the 29 studies investigated MATTHEW KING active or athletic populations. Importantly, none of the included studies Adapted from: King MG, Lawrenson investigated true community-based PR, Semciw AI, et al. Lower limb populations. Pooled data indicate that biomechanics in femoroacetabular labral tears were observedin 62% (95% impingement syndrome: a systematic confidence interval (CI)47% to 75%) of review and meta-analysis. British Journal symptomatic individuals and 54% (95%CI of Sports Medicine, 2018, Epub ahead of 41% to 66%) of asymptomatic individuals. print doi:10.1136/bjsports-2017-097839 Cartilage defects were reportedin64% (95%CI 25% to 91%) of symptomaict Why do some people with morphological individuals,compared to 12% 5%C(9I 7% changes in their hips go on to develop to 21%) of asymptomatic indviduals.i FAI syndrome and others not? As FAI More, low risk of bias studies areneeded syndrome is a movement related to confirm or refine these vaes.lu condition, biomechanics may play a role in Fig 1: Hip 3t MRI images demonstrating cartilage deficits 38 VOLUME 36 • APRIL ISSUE 2018