title: Cementless Total Hip Arthroplasty in Hip Dysplasia with an Extensively Porous-Coated Cylindrical Stem Modified for Asians: A 12-Year Follow-Up Study.
abstract: Long-term outcomes of primary cementless total hip arthroplasty were examined for 198 hips of Asian patients with developmental dysplasia of the hip. AML stems were modified for patients' relatively small physique. Stable fixation was achieved despite various proximal femoral deformities. At follow up (mean 12.1 years), radiographs demonstrated fixation in all hips, with 100% stem survivorship. Radiographic changes revealed that the severity of stress-shielding was mild in 55% of hips, moderate in 26%, and severe in 19%. Longer follow up is needed to determine whether these changes will develop into clinical manifestations. A distal fixation stem can be a useful reconstruction option when application of a proximal fixation stem in primary total hip arthroplasty is difficult for various reasons.
authors: Department of Orthopaedic Surgery, Kanagawa Rehabilitation Hospital, Atsugi, Kanagawa Japan; Department of Orthopaedic Surgery, The Jikei University School of Medicine, Minato-ku, Tokyo Japan.
authors: Tsutomu
authors: T
authors: Kato
authors: Department of Orthopaedic Surgery, The Jikei University School of Medicine, Minato-ku, Tokyo Japan.
authors: Takuya
authors: T
authors: Otani
authors: Department of Orthopaedic Surgery, Kanagawa Rehabilitation Hospital, Atsugi, Kanagawa Japan; Department of Orthopaedic Surgery, The Jikei University School of Medicine, Minato-ku, Tokyo Japan.
authors: Hajime
authors: H
authors: Sugiyama
authors: Department of Orthopaedic Surgery, Kanagawa Rehabilitation Hospital, Atsugi, Kanagawa Japan; Department of Orthopaedic Surgery, The Jikei University School of Medicine, Minato-ku, Tokyo Japan.
authors: Tetsuo
authors: T
authors: Hayama
authors: Department of Orthopaedic Surgery, Kanagawa Rehabilitation Hospital, Atsugi, Kanagawa Japan.
authors: Souichi
authors: S
authors: Katsumata
authors: Department of Orthopaedic Surgery, The Jikei University School of Medicine, Minato-ku, Tokyo Japan.
authors: Keishi
authors: K
authors: Marumo
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation* / Q000379:methods*; D044466:Asian People; D005260:Female; D005500:Follow-Up Studies; D006618:Hip Dislocation, Congenital / Q000000981:diagnostic imaging / Q000208:ethnology / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D010014:Osteolysis / Q000000981:diagnostic imaging; D016062:Porosity; D011474:Prosthesis Design; D011859:Radiography; D012189:Retrospective Studies; D016896:Treatment Outcome
keywords: biological fixation; cementless total hip arthroplasty; clinical outcome; developmental dysplasia of the hip; implant design; stress shielding