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Journal of Bone and Joint Surgery - British Volume, Vol 88-B, Issue 3, 310-314.
doi: 10.1302/0301-620X.88B3.17087  
Copyright © 2006 by British Editorial Society of Bone and Joint Surgery
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The Kent hip prosthesis

AN EVALUATION OF 145 PROSTHESES AFTER A MEAN OF 5.1 YEARS

S. A. Sexton, BA, MA, MRCS, Orthopaedic Specialist Registrar1; C. A. Stossel, FRCS(Ed), FRCS(Eng), Consultant Orthopaedic Surgeon2; and F. S. Haddad, BSc, MCh(Orth), FRCS(Orth), Consultant Orthopaedic Surgeon3

1 St Helier Hospital, Wrythe Lane, Carshalton, Surrey SM5 1AA, UK.
2 Flagstones, Millbank, Headcorn, Ashford TN27 9RB, UK.
3 University College London Hospital, Maple House, 25 Grafton Way, London WC1E 6DB, UK.

Correspondence should be sent to Mr S. A. Sexton at Vachery Cottage, Hook Lane, Shere, Surrey GU5 9QQ, UK; e-mail: shaunsexton{at}doctors.org.uk

The Kent hip is a distally-locked femoral stem which was developed to address severe proximal bone loss, severe bony deformity and peri-prosthetic fracture.

We reviewed the results of 145 consecutive Kent hips implanted into 141 patients between 1987 and 2000. The indications for implantation were aseptic loosening (75 hips), septic loosening (two), peri-prosthetic and prosthetic fracture (37), severe bony deformity (24), and fracture through a proximal femoral metastasis (seven).

The median time to full weight-bearing after surgery was two days and the mean length of follow-up was 5.1 years (2 to 15). Further revisions were required for 13 femoral stems. With removal of the stem for any reason as an end-point, the cumulative survival at five, ten and 15 years was 93%, 89% and 77%, respectively. In patients aged ≥ 70 years, the cumulative survival at 15 years was 92%, compared with 68% in those aged < 70 years. Because of these findings, we recommend the use of interlocking stems in patients aged ≥ 70 years, particularly in those with a peri-prosthetic fracture, for whom alternative methods are limited. Outcome scores and survival data, compared with other systems, indicate that the Kent hip should be used with caution in younger patients.






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