How Does Electromagnetic Navigation Stack Up Against Infrared Navigation in Minimally Invasive Total Knee Arthroplasties?

Abstract Forty-six primary total knee arthroplasties were performed using either an electromagnetic (EM) or infrared (IR) navigation system. In this IRB-approved study, patients were evaluated clinically and for accuracy using spiral computed tomographic imaging and 36-in standing radiographs. Altho...

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Bibliographic Details
Published in:	The Journal of arthroplasty 2008-06, Vol.23 (4), p.573-580
Main Authors:	Lionberger, David R., MD, Weise, Jennifer, BS, Ho, David M., MS, Haddad, John L., MD
Format:	Article
Language:	eng
Subjects:	Aged Arthritis, Rheumatoid - surgery Arthroplasty, Replacement, Knee - instrumentation computer-assisted orthopedic surgery Electromagnetic Fields electromagnetic navigation Female Humans Infrared Rays Male mechanical alignment Middle Aged minimally invasive Orthopedics Osteoarthritis, Knee - surgery Prospective Studies Sensitivity and Specificity surgery Surgery, Computer-Assisted - instrumentation Tomography, Spiral Computed total knee arthroplasty
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Summary:	Abstract Forty-six primary total knee arthroplasties were performed using either an electromagnetic (EM) or infrared (IR) navigation system. In this IRB-approved study, patients were evaluated clinically and for accuracy using spiral computed tomographic imaging and 36-in standing radiographs. Although EM navigation was subject to metal interference, it was not as drastic as line-of-sight interference with IR navigation. Mechanical alignment was ideal in 92.9% of EM and 90.0% of IR cases based on spiral computed tomographic imaging and 100% of EM and 95% of IR cases based on x-ray. Individual measurements of component varus/valgus and sagittal measurements showed EM to be equivalent to IR, with both systems producing subdegree accuracy in 95% of the readings.
ISSN:	0883-5403 1532-8406