The Journal of Bone and Joint Surgery, Vol 63, Issue 6 946-954, Copyright © 1981 by Journal of Bone and Joint Surgery, Inc
Unicompartmental knee arthroplasty using polycentric and geometric hemicomponents
WT Jones, RS Bryan, LF Peterson and DM Ilstrup
Unicompartmental knee arthroplasty was performed in 207 knees of 179
patients using either a polycentric (188) or a geometric (nineteen)
hemicomponent. After an average follow-up of 2.6 years, the results in 184
(89 per cent) of the knees were satisfactory. Pain and the need for
ambulatory aids were reduced, and the distance the patients could walk was
increased. Twenty-three (11 per cent) of the 207 procedures were rated as
failures. The major cause of failure was loosening of the components
(tibial in twelve and femoral in one); there also were unexplained pain in
five knees, problems with the opposite unreplaced compartment in three,
technical error in one, and pain in the patellofemoral joint in one. Nine
of 155 intraoperative specimens for bacterial culture obtained during
unicompartmental arthroplasty were positive, and two specimens that were
positive on culture were obtained during revision of twenty failed
unicompartmental arthroplasties. No gross or histological evidence of
infection was demonstrated at operation. Based on this study, we concluded
that this procedure can provide satisfactory relief of pain, adequate knee
motion, and increased levels of independence and activity for patients with
unicompartmental disease who are not suitable candidates for proximal
tibial osteotomy or total knee replacement.
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