title: Richard C. Johnston, M.D. evaluator and practitioner of hip surgery.
authors.forename: J J
authors.initials: JJ
authors.lastname: Callaghan
mesh_terms: D006622:Hip Prosthesis / Q000266:history*; D049673:History, 20th Century; D006801:Humans; D007484:Iowa; D009985:Orthopedics / Q000266:history; D012955:Societies, Medical / Q000266:history