Comput. Aided Surg. - Cadaveric analysis of an accelerometer-based portable navigation device for distal femoral cutting block alignment in total knee arthroplasty.

Tópicos

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Resumo

Femoral intramedullary guides have been shown to be insufficiently accurate in creating a distal femoral resection perpendicular to the mechanical axis in total knee arthroplasty (TKA), as they make assumptions regarding the difference between the patient's femoral mechanical and anatomical angles. The aim of this cadaveric study was to validate the accuracy of a portable accelerometer-based navigation device for alignment of the distal femoral cutting block in TKA. Twenty-nine trials were performed on five cadaveric specimens (hip-to-ankle), in which the distal femoral cutting block was placed using the KneeAlign 2? navigation device. For each specimen, a preoperative "target" was assigned for varus/valgus and flexion/extension alignment of the cutting block. The actual alignment of each cutting block was then measured using the ORTHOsoft Computer Assisted Surgery (CAS) system. The mean absolute difference between the preoperative target and the alignment of the cutting block was 0.83 ? 0.60? for varus/valgus, and 0.83 ? 0.83? for flexion/extension. The KneeAlign 2? navigation device can set and align the distal femoral resection guide with the same accuracy as a large-console CAS system, thus demonstrating that portable accelerometer-based navigation can be used reliably in total knee arthroplasty.

Resumo Limpo

femor intramedullari guid shown insuffici accur creat distal femor resect perpendicular mechan axi total knee arthroplasti tka make assumpt regard differ patient femor mechan anatom angl aim cadaver studi valid accuraci portabl accelerometerbas navig devic align distal femor cut block tka twentynin trial perform five cadaver specimen hiptoankl distal femor cut block place use kneealign navig devic specimen preoper target assign varusvalgus flexionextens align cut block actual align cut block measur use orthosoft comput assist surgeri cas system mean absolut differ preoper target align cut block varusvalgus flexionextens kneealign navig devic can set align distal femor resect guid accuraci largeconsol cas system thus demonstr portabl accelerometerbas navig can use reliabl total knee arthroplasti

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