Nonspherical Femoral Head Shape (Pistol Grip Deformity), Neck Shaft Angle, and Risk of Hip Osteoarthritis.

The article presents the study which examines the association of nonspherical femoral head shape or pistol grip deformity and neck shaft angle as risk factors of hip osteoarthritis (OA). It focuses on the findings which indicate the increased prevalence of pistol grip deformity and an abnormally low neck shaft angle in unaffected hips are risk factors for development of hip OA. However, both a nonspherical head shape and an increase in neck shaft angle may occur as a consequence of OA.