title: Accuracy of A Handheld Accelerometer-Based Navigation System for Femoral and Tibial Resection in Total Knee Arthroplasty.
abstract: Restoration of mechanical axis in total knee arthroplasty (TKA) is correlated with improved implant survivorship. We assessed the accuracy and required surgical time using a hand-held accelerometer-based navigation system for TKA. Data collected on 53 patients included assembly, resection, and tourniquet times. Implant alignment and mechanical axis were measured on radiographs. Femoral alignment was 0.29° ± 2.2° varus. Tibial alignment was 0.09° ± 1.4° valgus. Postoperative mechanical axis was 0.2° ± 2.1° varus. Malalignment rates for the femur, tibia, and axis were 13%, 3.8%, and 17%, respectively. Average time for pinning and navigating was 3.6 minutes for the femur and 2.6 minutes for the tibia; mean tourniquet time was 62 minutes. This navigation system accurately re-established mechanical axis without increasing surgical time.
authors.affiliation: University of Texas Health Science Center, Houston, Texas.
authors.forename: Eddie H
authors.initials: EH
authors.lastname: Huang
authors.affiliation: Division of Orthopaedic Surgery, Scripps Clinic, La Jolla, California.
authors.forename: Steven N
authors.initials: SN
authors.lastname: Copp
authors.affiliation: Division of Orthopaedic Surgery, Scripps Clinic, La Jolla, California.
authors.forename: William D
authors.initials: WD
authors.lastname: Bugbee
mesh_terms: D061725:Accelerometry / Q000295:instrumentation; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation* / Q000706:statistics & numerical data; D005260:Female; D005269:Femur / Q000601:surgery*; D005594:Fracture Fixation, Intramedullary; D006801:Humans; D008297:Male; D008875:Middle Aged; D061646:Operative Time; D025321:Surgery, Computer-Assisted / Q000295:instrumentation* / Q000706:statistics & numerical data; D013977:Tibia / Q000601:surgery*
keywords: alignment; computer-assisted surgery; navigation; replacement; total knee arthroplasty