title: Hybrid total hip arthroplasty using specifically-designed stems for patients with developmental dysplasia of the hip. A minimum five-year follow-up study.
abstract: A 4-U hybrid total hip arthroplasty (THA) system was specifically designed for patients with developmental dysplasia of the hip (DDH). Straight stem with an appropriate offset and various size variations are advantages. We followed 128 hips in 124 patients, 13 men and 111 women, for a mean of 6.5 years (range, 5.0-7.5 years). Two acetabular and femoral components in two patients had been revised for infection, one acetabular component had been revised for recurrent dislocation, and one femoral component had been revised for periprosthetic femoral fracture. None of the acetabular or femoral components were revised for loosening or were found to be loose at follow-up. The Harris hip score increased from a preoperative average of 42 points to 88 points at the most recent follow-up. Primary THA using the 4-U system had a good mid-term result in patients with DDH. This system could be applied for all patients including those with the narrowest and deformed femurs.
authors.affiliation: Department of Orthopaedic Surgery, Asahikawa Medical University, Asahikawa, Japan. itohiro@asahikawa-med.ac.jp
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ito
authors.forename: Hiromasa
authors.initials: H
authors.lastname: Tanino
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Yamanaka
authors.forename: Toshiki
authors.initials: T
authors.lastname: Nakamura
authors.forename: Takeo
authors.initials: T
authors.lastname: Matsuno
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects / Q000295:instrumentation* / Q000379:methods*; D017760:Bone Malalignment; D005260:Female; D005500:Follow-Up Studies; D006304:Health Status; D006618:Hip Dislocation, Congenital / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D011474:Prosthesis Design; D011475:Prosthesis Failure; D016459:Prosthesis-Related Infections; D011788:Quality of Life; D020127:Recovery of Function; D012086:Reoperation