Is computer-assisted surgery in total knee arthroplasty as accurate as it can be?

David R. Lionberger, Catherine L. Crocker, Mohammad H. Rahbar

Research output: Contribution to journalArticlepeer-review


Three hundred and eighty computer-assisted total knee arthroplasty cases were reviewed for accuracy of mechanical alignment. The 331 patients in the first set, designated Group A, showed a consistent valgus error of 1° from neutral alignment. It was hypothesized that a manual 1° varus correction during femur resection would yield a significantly greater level of accuracy in the second set of 49 patients, designated Group B. A mechanical alignment of ± 3° was achieved in 91% of the uncalibrated Group A patients, which was significantly lower (p = 0.035) than the rate of 98% achieved in the calibrated Group B. Further statistical analysis of the data showed the time expenditure was not significantly changed once a new target value was recalibrated. By quantifying mean errors of measures at an early timeframe, enhanced accuracy in CAS can be achieved.

Original languageEnglish (US)
Pages (from-to)198-204
Number of pages7
JournalComputer Aided Surgery
Issue number4
StatePublished - Jul 2012


  • Accuracy
  • Alignment
  • Femoral resection
  • Recalibration
  • Total knee arthroplasty

ASJC Scopus subject areas

  • Surgery
  • Radiology Nuclear Medicine and imaging


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