title: Arthrokatadysis in trisomy 18.
abstract: Protrusio acetabuli may be characterized by an inward displacement of the femoral head into the pelvis. A 20-year-old patient with trisomy 18, who is also notable for her longevity, developed bilateral protrusio over a course of 2 years. We believe that trisomy 18 should be considered a cause of protrusio.
mesh_terms: D000077:Acetabulum / Q000002:abnormalities*; D000328:Adult; D002902:Chromosomes, Human, 16-18; D005260:Female; D005270:Femur Head / Q000002:abnormalities*; D006618:Hip Dislocation, Congenital / Q000150:complications; D006801:Humans; D008607:Intellectual Disability / Q000150:complications; D014314:Trisomy