Casartelli NC, Maffiuletti NA, Valenzuela PL, et al. - This systematic review with meta-analysis was attempted to appraise the highest evidence on hip morphology as a risk factor for developing hip osteoarthritis (OA). MEDLINE, EMBASE, Web of Science, Scopus, Cochrane Library and PEDro databases were explored to identify studies assessing the connection between radiological hip morphology parameters and the prevalence, incidence or progression of hip OA (based on different radiographic and clinical criteria). The meta-analysis involved 9 prospective and 21 cross-sectional studies, and 42,831 hips from 25,898 persons (mean age: 59 years) were assessed. Findings revealed a consistent association of both cam morphology and hip dysplasia with the development of hip OA. Cross-sectional studies, but not prospective studies, showed a connection of pincer morphology with hip OA. A clear inference regarding the link of pincer morphology with hip OA is limited by heterogeneous quantification of pincer morphology on radiographs.