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Journal of Bone and Joint Surgery - British Volume, Vol 87-B, Issue 10, 1344-1351.
doi: 10.1302/0301-620X.87B10.16559  
Copyright © 2005 by British Editorial Society of Bone and Joint Surgery
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Five-year clinical, radiological and postmortem results of the Cambridge Cup in patients with displaced fractures of the neck of the femur

R. E. Field, PhD, FRCS, FRCS(Orth), Consultant Orthopaedic Surgeon1; and N. Rushton, MD, FRCS, Professor in Orthopaedics2

1 Epsom and St Helier University Hospital NHS Trust, Wrythe Lane, Carshalton, Surrey SM5 1AA, UK.
2 Orthopaedic Research Unit, University of Cambridge, Addenbrooke’s Hospital, Box 180, Cambridge CB2 2QQ, UK.

Correspondence should be sent to Mr R. E. Field; e-mail: richardefield{at}aol.com

The Cambridge Cup has been designed to replace the horseshoe-shaped articular cartilage of the acetabulum and the underlying subchondral bone. It is intended to provide physiological loading with minimal resection of healthy bone.

The cup has been used in 50 women with displaced, subcapital fractures of the neck of the femur. In 24 cases, the cup was coated with hydroxyapatite. In 26, the coating was removed before implantation in order to simulate the effect of long-term resorption.

The mean Barthel index and the Charnley-modified Merle d’Aubigné scores recovered to their levels before fracture. We reviewed 30 women at two years, 21 were asymptomatic and nine reported minimal pain. The mean scores deteriorated slightly after five years reflecting the comorbidity of advancing age. Patients with the hydroxyapatite-coated components remained asymptomatic, with no wear or loosening. The uncoated components migrated after four years and three required revision. This trial shows good early results using a novel, hydroxyapatite-coated, physiological acetabular component.






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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General