Journal
JOURNAL OF ARTHROPLASTY
Volume 19, Issue 7, Pages 87-94Publisher
CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS
DOI: 10.1016/j.arth.2004.07.009
Keywords
meniscal-bearing; mobile-bearing; unicompartmental prosthesis; knee arthroplasty; low contact stress; bearing wear
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The original Oxford and Low Contact Stress mobile-bearing unicompartmental knee designs have been used successfully since the mid- 1970s, but have had limited exposure. Our study reviews 177 LCS unicompartment replacements (156 medial) with 5-19 years follow-up. Mean age was 68 years, 70% were female, with osteoarthritis (OA) diagnosis in 96%. Fixation was cementless in 72% and cemented in 28%. Results were good/excellent [modified Hospital for Special Surgery (HSS)] in 82%. Scores improved from 60 to 86, mean range of motion 123degrees. Complications requiring reoperation were 32 of 177 knees (18%). Early failures were technique-related and late failures (3+ years) related to bearing wear/fracture; 15 cases required bearing exchange alone. Low contact stress mobile-bearing unicompartmental knee arthroplasties with 82% prosthetic survivorship at 11 years is encouraging, especially in a more active population and with the success of bearing exchange. (C) 2004 Elsevier Inc. All rights reserved.
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