Optimising femoral component rotation using Equiflex instrumentation: a clinical review

Our objective was to assess and validate low-dose computed tomography (CT) scanogram as a post-operative imaging modality to measure the mechanical axis after navigated total knee replacement. A prospective study was performed to compare intra-operative and post-operative mechanical axis after navigated total knee replacements. All consecutive patients who underwent navigated total knee replacement between May and December 2006 were included. The intra-operative final axis was recorded, and postoperatively a CT scanogram of lower limbs was performed. The mechanical axis was measured and compared against the intra-operative measurement. There were 15 patients ranging in age from 57 to 80 (average 70) years. The average final intra-operative axis was 0.56°varus (4°varus to 1.5°valgus) and post-operative CT scanogram axis was 0.52°varus (3.1°v arus to 1.8°valgus). The average deviation from final axes to CT scanogram axes was 0.12°valgus with a correlation coefficient of 0.9. Our study suggests that CT scanogram is an imaging modality with reasonable accuracy for measuring mechanical axis despite significantly low radiation. It also confirms a high level of correlation between intra-operative and post-operative mechanical axis after navigated total knee replacement.

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Assessment and validation of CT scanogram to compare per-operative and post-operative mechanical axis after navigated total knee replacement

Mohanlal

Jain

2008

International Orthopaedics (SICOT)

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Lateral Retinacular Release in Total Knee Arthroplasty

Bonutti

Maduekwe

Zywiel

et al. 2009

Seminars in Arthroplasty

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Optimising femoral component rotation using Equiflex instrumentation: a clinical review

Abstract: Although there is agreement that flexion and extension spaces should be symmetrical and that rotation of the femoral component impacts outcome in a knee replacement, there is dispute over what is the 'correct' rotation and how best to achieve it (Akagi et al

Cited by 2 publications

References 28 publications

Assessment and validation of CT scanogram to compare per-operative and post-operative mechanical axis after navigated total knee replacement

Assessment and validation of CT scanogram to compare per-operative and post-operative mechanical axis after navigated total knee replacement

Lateral Retinacular Release in Total Knee Arthroplasty

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