Sex refers to biology: chromosomal makeup, hormones, and anatomy. People are most often assigned male ... and socket (acetabulum) portions of the hip joint begins to thin and wear away. This causes ...

Correspondence to: Dr C J Michet Jr Division of Rheumatology, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA; michet.clementmayo.edu Objective: To determine the natural history of hip ...