title: Reduced dislocation rates and excellent functional outcomes with large-diameter femoral heads.
abstract: The purpose of this study was to compare the dislocation rates, functional outcomes, and radiographic results between large- and small-diameter femoral head components. A total of 225 patients (248-hips) who received total hip arthroplasties with large-diameter components (36mm or greater) were compared to 501 patients (559-hips) who received smaller diameter components (less than 36mm). Rates of dislocation and revision, Harris hip score, radiographic findings, and complications were compared between the groups. At a mean follow-up of approximately 5years, a significantly higher rate of dislocation was noted in the small-diameter group (10 of 559) compared to the large-diameter group (0 of 248). The overall implant survivorship, mean Harris hip scores, complication rates, and radiographic outcomes were similar for the two groups. The authors believe that large-diameter components significantly reduced the risk of dislocation in susceptible patients, while preserving good to excellent functional outcomes.
authors.affiliation: Center for Joint Preservation and Replacement, Rubin Institute for Advanced Orthopedics, Sinai Hospital of Baltimore, Baltimore, Maryland 21215, USA.
authors.forename: D Alex
authors.initials: DA
authors.lastname: Stroh
authors.forename: Kimona
authors.initials: K
authors.lastname: Issa
authors.forename: Aaron J
authors.initials: AJ
authors.lastname: Johnson
authors.forename: Ronald E
authors.initials: RE
authors.lastname: Delanois
authors.forename: Michael A
authors.initials: MA
authors.lastname: Mont
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D005260:Female; D005270:Femur Head / Q000033:anatomy & histology*; D005500:Follow-Up Studies; D006617:Hip Dislocation / Q000150:complications / Q000453:epidemiology*; D006621:Hip Joint / Q000000981:diagnostic imaging / Q000601:surgery*; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery*; D015995:Prevalence; D011474:Prosthesis Design; D011475:Prosthesis Failure / Q000209:etiology; D011859:Radiography; D012189:Retrospective Studies; D016896:Treatment Outcome; D055815:Young Adult
keywords: Harris hip score; big femoral head; dislocation rate; implant survivorship; large-diameter; total hip arthroplasty