title: Primary protrusion of the acetabulum. Report of affected identical twins.
mesh_terms: D000077:Acetabulum / Q000002:abnormalities* / Q000033:anatomy & histology; D000293:Adolescent; D004200:Diseases in Twins; D005260:Female; D005270:Femur Head; D006801:Humans; D008124:Locomotion; D009068:Movement; D010146:Pain; D010388:Pelvis / Q000000981:diagnostic imaging; D011859:Radiography