How does electromagnetic navigation stack up against infrared navigation in minimally invasive total knee arthroplasties?
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.
Southwest Orthopedic Group, LLP, Houston, Texas 77030, USA.
David R
DR
Lionberger
Jennifer
J
Weise
David M
DM
Ho
John L
JL
Haddad
D000368:Aged; D001172:Arthritis, Rheumatoid / Q000601:surgery*; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D004574:Electromagnetic Fields; D005260:Female; D006801:Humans; D007259:Infrared Rays; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D025321:Surgery, Computer-Assisted / Q000295:instrumentation*; D036542:Tomography, Spiral Computed