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The Journal of Bone and Joint Surgery, Vol 72, Issue 9 1349-1352, Copyright © 1990 by Journal of Bone and Joint Surgery, Inc
Comparison of a hybrid with an uncemented total hip replacement. A retrospective matched-pair study
WJ Maloney and WH Harris
Orthopaedic Biomechanics Laboratory, Massachusetts General Hospital, Boston 02114.
The efficacy of a type of uncemented total hip replacement was compared
with that of a hybrid total hip replacement in which an uncemented
acetabular and a cemented femoral component were used. Twenty-five patients
who had had a hybrid total hip replacement were matched, by age, weight,
sex, and diagnosis, with twenty-five patients who had had an uncemented
total hip replacement. All of the operations were done by one surgeon, who
used the same operative approach and the same regimen of postoperative
rehabilitation. All of the patients were followed for at least two years.
The mean postoperative hip score was 96 points for the hybrid group and 84
points for the cementless group (p less than 0.02). Twenty-four (96 per
cent) of the patients who had a hybrid prosthesis reported no or only
slight pain postoperatively. In the uncemented group, of the six patients
(24 per cent) who reported mild to severe pain, five had pain in the thigh,
a limp occurred more frequently, five femoral components had migrated, and
four hips needed reoperation. The results with the hybrid replacement that
had a cemented femoral component were superior to those with the uncemented
femoral component over the relatively brief period for which these patients
were followed.

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