The benefit of revision knee arthroplasty for component malrotation after primary total knee replacement.
OBJECTIVE
Revision surgery for component malrotation in the painful TKA is a relatively novel indication. The purpose of this study was to assess the benefit of revision TKA for component malrotation with regard to the clinical and functional outcomes.


METHODS
Our retrospective case-control study included 51 patients who underwent revision surgery for malrotation with mean follow up of 42 months. They were equally matched to patients who had surgery for aseptic loosening.


RESULTS
Knee society scores improved from 44/49 to 75/60 (p < 0.001) for the study group and 44/47 to 76/57 (p < 0.001) for the control group. There was no statistical difference between the groups, including for VAS scores, narcotic reduction or patient satisfaction. Our study showed that revision surgery for malrotation is as beneficial as surgery for aseptic loosening with regard to clinical and functional outcome.


CONCLUSIONS
We recommend CT in painful TKA to assess component malrotation for which revision TKA is beneficial.
Division of Orthopaedic Surgery, Mount Sinai Hospital, 600 University Ave Suite 476A, Toronto, Ontario, M5G 1X5, Canada. amirsternheim@gmail.com
Amir
A
Sternheim
Jasjit
J
Lochab
Michael
M
Drexler
Paul
P
Kuzyk
Oleg
O
Safir
Allan
A
Gross
David
D
Backstein
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation / Q000379:methods*; D016022:Case-Control Studies; D005260:Female; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000503:physiopathology* / Q000601:surgery*; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D011475:Prosthesis Failure; D016059:Range of Motion, Articular / Q000502:physiology*; D012086:Reoperation; D012189:Retrospective Studies; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome