title: Computed tomography-based custom-made stem for dysplastic hips in Japanese patients.
abstract: We investigated 55 hips of 53 patients with dysplastic hips. Individual computed tomography data were used in the manufacturing of cementless custom-made stems made of Ti-6Al-4V. The proximal one third was coated using porous coating covered with hydroxyapatite coating. The average age at surgery was 60 years and the average follow-up was 7 years. Five patients (9%) complained of postoperative thigh pain. According to Engh's radiologic classification system, there was bone-ingrown fixation in all hips. The cortical index and canal flare index were lower, and stem diameter was greater in the 11 hips (20%) with severe stress shielding than in the remaining 44 hips. Although the results obtained with this custom-made stem system for dysplastic hips were excellent, stress shielding is still an issue.
authors.affiliation: Department of Orthopaedic Surgery, Nara Medical University, Kashihara, Nara, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Kawate
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Ohneda
authors.forename: Tetsuji
authors.initials: T
authors.lastname: Ohmura
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yajima
authors.forename: Kazuya
authors.initials: K
authors.lastname: Sugimoto
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Takakura
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D001696:Biomechanical Phenomena / Q000502:physiology; D001848:Bone Diseases, Developmental / Q000208:ethnology / Q000601:surgery*; D017076:Computer-Aided Design; D017886:Durapatite; D005260:Female; D005500:Follow-Up Studies; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000502:physiology / Q000601:surgery; D006622:Hip Prosthesis; D006801:Humans; D007564:Japan; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011859:Radiography; D013314:Stress, Mechanical; D016896:Treatment Outcome
chemical_list: D017886:Durapatite