Total knee arthroplasty for osteonecrosis.
BACKGROUND
A patient with collapse of a femoral condyle caused by osteonecrosis has few treatment options other than total knee arthroplasty. The purpose of this study was to report the clinical and radiographic outcome of total knee arthroplasty for osteonecrosis.


METHODS
Between 1987 and 1996, thirty-two total knee arthroplasties were performed with cement in thirty patients with osteonecrosis of the femoral condyle and/or tibial plateau. The study group included twenty-forty women and five men with a mean age of fifty-four years (range, thirty-one to seventy-seven years) at the time of the arthroplasty. Twenty-two patients had atraumatic osteonecrosis associated with corticosteroid use, and eight had spontaneous osteonecrosis. All patients had a complete clinical and radiographic evaluation at a mean of 108 months (range, forty-eight to 144 months) postoperatively.


RESULTS
Overall, thirty-one (97%) of the thirty-two knees had a successful clinical outcome. The mean Knee Society score improved from 54 points preoperatively to 95 points at the time of the latest follow-up. No evidence of progressive radiolucency was found around any prosthetic component.


CONCLUSIONS
Previous studies have demonstrated less-than-optimal results following total knee arthroplasty in patients with osteonecrosis. The excellent results found in the present study may have been secondary to the use of cemented implants in all cases and ancillary stems when appropriate.
Mont
Michael A
MA
Department of Orthopedic Surgery, The Johns Hopins Medical Institute, Baltimore, Maryland 21287, USA. rhondamont@aol.com
Rifai
Aiman
A
Baumgarten
Keith M
KM
Sheldon
Michael
M
Hungerford
David S
DS
D000328:Adult; D000368:Aged; D005260:Female; D006801:Humans; D007719:Knee Joint; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D010020:Osteonecrosis / Q000601:surgery*