Conventional instruments are more accurate for measuring the depth of the tibial cut than computer-assisted surgery in total knee arthroplasty: a prospective study.

Archives of Orthopaedic and Trauma Surgery
Antonio KlasanMyles Raphael Coolican

Abstract

The most commonly used tool for implant positioning are conventional instruments (CI) followed by computer-assisted surgery (CAS). A number of studies have investigated the cutting error of the tibial component when CAS is used, but most of them were focused on the cutting angles. The accuracy of CAS to determine the depth of the cut has not received much attention, even though implications are similar or worse, than with an angle mismatch. This was an ethics board approved, prospective study of 23 consecutive varus TKAs by a single surgeon. Implant positioning was performed using CAS; however, the depth of the tibial cut was determined with both CAS and CI. Targeted alignment was the mechanical axis and 3° of posterior slope. The planned and the achieved cut, as determined by CAS needed to match. The achieved cut was then measured using a caliper and compared to the depth of the cut as per CAS. Medial and lateral cuts were analyzed separately. Analysis of variance and Bland-Altman plots were used for the comparison. Mean medial navigated cut was 6.3 (± 2.2) mm, mean measured medial cut was 6.6 (± 2.3) mm. Mean lateral navigated cut was 8.9 (± 1.8) mm, mean measured lateral cut was 8.8 (± 1.5) mm. There was a statistical signif...Continue Reading

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Citations

Feb 24, 2021·Archives of Orthopaedic and Trauma Surgery·Matthias MeyerMarkus Weber
Jul 14, 2021·Archives of Orthopaedic and Trauma Surgery·M PietschTh Hofstädter
Jul 15, 2021·Archives of Orthopaedic and Trauma Surgery·Cécile Batailler, Sébastien Parratte
Aug 14, 2021·Archives of Orthopaedic and Trauma Surgery·Stefano Marco Paolo RossiFrancesco Benazzo

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