Abstracts Posters SICOT-SOF meeting Gothenburg 2010 _2_

Poster
Topic: Navigation
Abstract number: 25234
POSITIONING OF COMPUTER-ASSISTED (CAS) TOTAL KNEE ARTHROPLASTY
(TKA) DURING THE LEARNING CURVE. COMPARISON OF LIMB AND
COMPONENT ALIGNMENT VERSUS CAS PERFORMED BY AN EXPERT. A
PROSPECTIVE RANDOMIZED TRIAL.
Carles ESTEVE 1 , Jaume OLIVERAS 2 , Gerard JORDA 1 , Emili PROVINCIALE 1 , Josep
GINÉ 1
1 Hospital Universitari de Tarragona Joan XXIII, Tarragona (SPAIN), 2 Hospital Sant
Bernabé, Berga (SPAIN)
Introduction: Success in total knee arthroplasty (TKA) is dependent on many factors.
Postoperative extremity and component alignment are determinants of outcome and
longevity. Computer-assisted (CAS) navigation devices were developed to improve
implant positioning but their use increases complexity. The aim of this study is to
assess the radiological outcome of CAS for TKA performed by an expert and other
group performed by a beginner in CAS.Methods100 patients patients were
prospective randomized into 2 groups: CAS performed by an expert (n=50) and CAS
performed during the learning curve (n=50). Preoperative and postoperative clinical
examinations were performed. Preoperative and postoperative radiographic
measurements were evaluated. The Knee Society Scoring System (KSS) was used
to asses clinical and functional outcomes. All variables were analysed for differences
between the groups either by Student’s t-test or the Mann-Whitney U test. Results:
There were no differences in implant positioning. In the expert group the mean
coronal tibial alignment was 90.25º (88º-92.5º) and mean coronal femoral alignment
90.15º (88º-93º) to the mechanical axis. In the “beginner” group the mean coronal
tibial alignment was 90.13º (86º-93º) and mean coronal femoral alignment 89.92º
(87º-92º) to the mechanical axis. Improvement in the KSS up to one year was similar
for the two groups. ConclusionsWe have not shown differences in the precise
positioning of implants during the learning curve. Our results show that the learning
curve in CAS for TKA maintains the accuracy of component aligment.
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