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Unicompartmental Knee Replacement: A Minimum 15 Year Follow Up Study.
READ COMPLETE STUDY
The Ranawat Award
Clinical Orthopaedics & Related Research. 367:61-72, October 1999.
Squire, Matthew W. MD *; Callaghan, John J. MD *; Goetz, Devon D. MD **;
Sullivan, Patrick M. MD **; Johnston, Richard C. MD * Abstract:
One hundred forty Marmor cemented unicompartmental knee replacements were
inserted in 103 patients between 1975 and 1982. Fifty-two patients were women
and 51 were men. One hundred twenty-five were medial compartment knee
replacements and 15 were lateral knee replacements. At minimum 15 year followup
34 patients with 48 knee replacements were living; only four patients with four
knee replacements were lost to followup. Average preoperative and final followup
Hospital for Special Surgery knee scores were 57 and 82 points, respectively for
the knees of living patients. Average preoperative and final followup Knee
Society clinical and Knee Society functional scores were 31 and 42, and 85 and
71 points, respectively. For all knees, 10.2% (14 knees) were revised [4.4% (six
knees) for tibial loosening, 5.1 % (seven knees) for disease progression, and.7%
(one knee) for pain]. For patients living 15 years, 12.5% (six knees) were
revised [2.1% (one knee) for tibial loosening, and 10.4% (five knees) for
disease progression]. Revision for failure of fixation of these unicompartmental
replacements was comparable with that reported for fixed bearing total knee
replacement. Disease progression (46%; 62 of 136 knees) and tibial subsidence
with wear (10.4%; 15 of 136 knees, five of which required revision) were the
major long term problems in this group of patients.
(C) 1999 Lippincott Williams & Wilkins, Inc.
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