title: The Birmingham hip resurfacing prosthesis: an independent single surgeon's experience at 7-year follow-up.
abstract: An independent single surgeon's 7-year experience with Birmingham hip resurfacing is presented. The study also involved investigation of the significance of pedestal sign in patients requiring revision. A consecutive 117 hips in 101 patients (59 male and 42 female patients) operated on by the senior author (VGJ) were assessed at a mean follow-up of 7 years (range, 5-9.4 years). Mean age at surgery was 54 years (range, 20-74 years). Seventy-three hips had a preoperative diagnosis of primary osteoarthritis, and secondary osteoarthritis was seen in 44 hips. Failure was defined as revision for any reason. Revision of the femoral component alone was undertaken in 8 hips (6.8%): 5 within first year for periprosthetic fracture neck of femur and in 3 hips after 5 years of follow-up. In 2 patients who were known to have osteonecrosis of the femoral head preoperatively, the femoral component progressively collapsed into varus after 5 years of follow-up. Pedestal sign was the earliest radiologic sign noted in these 2 patients and progressed rapidly within 1 year on serial radiographs well before the onset of clinical symptoms. Kaplan-Meier survival with revision as end point at 7 years was 91.5% (95% confidence interval, 97.6%-85.4%).
authors.affiliation: Department of Trauma and Orthopedics, Hull Royal Infirmary, Anlaby Road, Hull, United Kingdom.
authors.forename: Tiruveedhula S
authors.initials: TS
authors.lastname: Madhu
authors.forename: Mahesh R
authors.initials: MR
authors.lastname: Akula
authors.forename: Raghu N
authors.initials: RN
authors.lastname: Raman
authors.forename: Hemant K
authors.initials: HK
authors.lastname: Sharma
authors.forename: Verne G
authors.initials: VG
authors.lastname: Johnson
mesh_terms: D000328:Adult; D000368:Aged; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation*; D005260:Female; D005265:Femoral Neck Fractures / Q000000981:diagnostic imaging / Q000601:surgery; D005271:Femur Head Necrosis / Q000000981:diagnostic imaging / Q000601:surgery; D005500:Follow-Up Studies; D006622:Hip Prosthesis / Q000145:classification* / Q000592:standards*; D006801:Humans; D053208:Kaplan-Meier Estimate; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000601:surgery*; D057068:Periprosthetic Fractures / Q000000981:diagnostic imaging / Q000601:surgery; D011859:Radiography; D012086:Reoperation