Evaluation of tibial component angles in 79 consecutive total knee arthroplasties

The tibial component angles (TCAs) were measured from the post-operative radiographs of 79 consecutive total knee arthroplasties (TKRs) to determine the prevalence of tibial component malposition. The mean TCA was 86.88° (S.D.±2.84°). Thirty-eight (48%) of the TKRs had TCAs of less than 87° and were therefore positioned in an unacceptable degree of varus. Such a high proportion of malorientated tibial components may compromise clinical results.