title: Femoral neck remodelling after hip resurfacing surgery: a radiological study.
abstract: BACKGROUND
  Narrowing of the femoral neck under the femoral component of the hip resurfacing has been noted previously and has raised concern. In this study we examined the X-rays of patients following Birmingham hip resurfacing surgery at 6-years follow-up.
  
  
  METHODS
  Bony changes proximally and distally were measured. Fifty-two patients were available for evaluation.
  
  
  RESULTS
  There were 40 (76.9%) men and 12 (23.1%) women, with a mean age of 52 years (25-64). The unoperated contralateral femoral neck was measured as a control. We found femoral neck narrowing proximally in 82.7% of patients and distally in 26.9% and on the contralateral side in 54.5%. The average narrowing was 3.6%. Widening was observed proximally in 17.3% and distally in 73.1% and on the contralateral side in 45.5%. The average widening was 3.9%. Four of the 52 patients had proximal narrowing exceeding 10% of the femoral neck diameter, and one of the 52 patients had inferior narrowing exceeding 10%.
  
  
  CONCLUSIONS
  Gender, body mass index, component size and age did not affect remodelling. We conclude that the observed findings are likely to be a manifestation of a generalized remodelling response in the femoral neck rather than a localized and isolated narrowing at the junction of the component and the femoral neck.
authors: Joint Orthopaedic Centre, Sydney, New South Wales, Australia; University of Technology Sydney, Sydney, New South Wales, Australia.
authors: Lawrence
authors: L
authors: Kohan
authors: Clarice
authors: C
authors: Field
authors: Dennis
authors: D
authors: Kerr
authors: Besim
authors: B
authors: Ben-Nissan
mesh_terms: D000328:Adult; D019644:Arthroplasty, Replacement, Hip / Q000295:instrumentation / Q000379:methods*; D016723:Bone Remodeling; D005260:Female; D005272:Femur Neck / Q000000981:diagnostic imaging / Q000502:physiology* / Q000601:surgery; D005500:Follow-Up Studies; D006622:Hip Prosthesis; D006801:Humans; D008297:Male; D008875:Middle Aged; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging / Q000601:surgery*; D011859:Radiography; D016896:Treatment Outcome
keywords: femoral neck width; hip resurfacing; neck remodelling