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Long-term Clinical Results of the Medial Oxford Unicompartmental Knee
Arthroplasty.
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Clinical Orthopaedics & Related Research. 435:171-180, June 2005.
Price, A J DPHIL, FRCS (ORTH); Waite, J C FRCS (ORTH); Svard, U MD
Abstract:
The medial Oxford unicompartmental knee arthroplasty uses a fully congruent
mobile bearing, varying in thickness from 3.5-11.5 mm. Impressive clinical and
survival results have been achieved by the designing surgeon, but can they be
reproduced by an independent center and does the use of bearings less than 6 mm
thick reduce the implant's survival? Between November 1983 and May 2000, 439
medial Oxford prostheses were implanted by three surgeons in Skovde, Sweden. One
hundred fourteen knees (89 patients) were reviewed clinically at a minimum of 10
years postoperatively, using the Hospital for Special Surgery knee score.
Ninety-one percent of the knees had good or excellent results, with no poor
results, and 82% were reported as pain free. The 15-year survival rate for the
entire cohort was 93%, and for the 432 knees (344 patients) that met the current
indications for using the device, the survival rate was 94%. The 10-year
survival rate for bearings less than 6 mm thick was 95%, compared with 94% with
bearings greater than 6 mm. The results show that an independent center can
achieve excellent long-term clinical and survival results in patients implanted
with the Oxford prosthesis. Survival of the implant was not reduced by the use
of thin polyethylene bearings.
Level of Evidence: Therapeutic study, Level IV (case series-no, or historical,
control group). See the Guidelines for Authors for a complete description of
levels of evidence.
(C) 2005 Lippincott Williams & Wilkins, Inc.
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