Clinical and radiological outcomes after revision to the low-contact-stress mobile-bearing total knee arthroplasty.
BACKGROUND
The aim of the present study was to investigate the short-medium-term clinical and radiological outcomes in revision total knee arthroplasty using a mobile-bearing implant.


METHODS
Forty patients (42 knees) who had revisions using the New Jersey low-contact-stress (LCS) mobile-bearing total knee arthroplasty between 1996 and 2000 were reviewed.


RESULTS
The average age at revision was 71 years (range, 38-86 years) and the average follow up was 6 years (range, 5-9 years). Of the 34 patients reviewed clinically, six had excellent results, and 20 had good results, to give a total of 76% excellent or good results. There were five (15%) fair results and three (9%) poor results. Seven patients required revision of the components. There was one case of instability within the first year of revision, which required only exchange of the polyethylene bearing to achieve a satisfactory clinical outcome. Of the 31 knees reviewed radiologically, progressive radiolucent lines were seen at the bone-cement interface in five (16%) of the femoral components and in two (6%) of the tibial components.


CONCLUSIONS
Unconstrained LCS mobile-bearing total knee arthroplasty can be used in revision surgery with satisfactory results after medium-term follow up (level of evidence: therapeutic level III).
Whitehead
David J
DJ
Orthopaedic Department, Christchurch Public Hospital, Christchurch, New Zealand. david.whitehead@xtra.co.nz
Hooper
Gary J
GJ
Bell
Virginia
V
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D011095:Polyethylenes; D011474:Prosthesis Design; D012086:Reoperation; D016019:Survival Analysis; D016896:Treatment Outcome; D016474:Weight-Bearing
D011095:Polyethylenes