title: Accelerometer-based computer navigation for performing the distal femoral resection in total knee arthroplasty.
abstract: The use of intramedullary alignment guides for performing the distal femoral resection in total knee arthroplasty (TKA) have not been shown to be highly accurate. Forty-eight knees underwent a TKA using a portable, accelerometer-based surgical navigation system for performing the distal femoral resection (KneeAlign 2 system; OrthAlign, Inc, Aliso Viejo, Calif). Of the femoral components, 95.8% were placed within 90° ± 2° to the femoral mechanical axis in the coronal plane, and 93.8% of the TKAs had an overall lower extremity alignment within 3° of neutral to the mechanical axis, based on postoperative, standing, hip-to-ankle radiographs. The KneeAlign 2 is highly accurate in positioning the femoral component in TKA, and accelerometer-based navigation is able to reliably determine the hip center of rotation and femoral mechanical axis.
authors.affiliation: Adult Reconstruction and Joint Replacement Service, Department of Orthopaedic Surgery, Hospital for Special Surgery, Weill Medical College of Cornell University, New York, New York, USA.
authors.forename: Denis
authors.initials: D
authors.lastname: Nam
authors.forename: Danyal H
authors.initials: DH
authors.lastname: Nawabi
authors.forename: Michael B
authors.initials: MB
authors.lastname: Cross
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Heyse
authors.forename: David J
authors.initials: DJ
authors.lastname: Mayman
mesh_terms: D000054:Acceleration; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation*; D004867:Equipment Design; D005260:Female; D005269:Femur / Q000601:surgery*; D006801:Humans; D007720:Knee Prosthesis; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D011474:Prosthesis Design; D025321:Surgery, Computer-Assisted / Q000295:instrumentation*; D016896:Treatment Outcome