title: Accelerometer-Based Navigation Is as Accurate as Optical Computer Navigation in Restoring the Joint Line and Mechanical Axis After Total Knee Arthroplasty: A Prospective Matched Study.
abstract: The Zimmer iASSIST system is a novel accelerometer-based navigation system for TKA. 76 patients (76 knees) were prospectively matched for age, BMI, gender, diagnosis, and pre-operative scores, and underwent TKA using the iASSIST (n=38) or optical CAS (n=38). There were no significant differences in clinical outcomes or satisfaction rates at six months post-operatively (P>0.05). Mechanical axis was 1.8±1.3° in the iASSIST cohort versus 2.1±1.6° in the CAS cohort (P=0.543). There were no significant differences in number of outliers for mechanical axis (P=1.000), coronal femoral-component angle (P=0.693), coronal tibial-component angle (P=0.204) or joint line deviation (P=1.000). The duration of surgery was significantly longer in the CAS group (P<0.001), while the added cost of accelerometer-based navigation was approximately $1000 per operation.
authors.affiliation: Department of Orthopedic Surgery, Singapore General Hospital, Singapore.
authors.forename: Graham Seow-Hng
authors.initials: GS
authors.lastname: Goh
authors.affiliation: Department of Orthopedic Surgery, Singapore General Hospital, Singapore.
authors.forename: Ming Han Lincoln
authors.initials: MH
authors.lastname: Liow
authors.affiliation: Department of Orthopedic Surgery, Singapore General Hospital, Singapore.
authors.forename: Winston Shang-Rong
authors.initials: WS
authors.lastname: Lim
authors.affiliation: Department of Orthopedic Surgery, Singapore General Hospital, Singapore.
authors.forename: Darren Keng-Jin
authors.initials: DK
authors.lastname: Tay
authors.affiliation: Department of Orthopedic Surgery, Singapore General Hospital, Singapore.
authors.forename: Seng Jin
authors.initials: SJ
authors.lastname: Yeo
authors.affiliation: Department of Orthopedic Surgery, Singapore General Hospital, Singapore.
authors.forename: Mann Hong
authors.initials: MH
authors.lastname: Tan
mesh_terms: D061725:Accelerometry; D000368:Aged; D000369:Aged, 80 and over; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D004867:Equipment Design; D005260:Female; D006801:Humans; D007717:Knee / Q000601:surgery; D007719:Knee Joint / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery; D011446:Prospective Studies; D025321:Surgery, Computer-Assisted / Q000379:methods*; D013977:Tibia / Q000502:physiology / Q000601:surgery*
keywords: accelerometer-based navigation; alignment; iASSIST; joint line; mechanical axis; total knee arthroplasty