title: The use of navigation in total knee arthroplasty for patients with extra-articular deformity.
abstract: Computer-assisted navigation for total knee arthroplasty provides high technology instrumentation that may improve the technique for restoring the normal lower limb mechanical axis. This study evaluated the use of computer-assisted navigation in 7 patients (9 total knee arthroplasties) with a radiographic femoral extra-articular deformity. Postoperatively, the mechanical axis deviated medially by a mean of 1.3 degrees +/- 0.9 degrees (range, -0.2 degrees to 2.5 degrees ). Early patient outcomes showed an increase in the average preoperative to postoperative Knee Society Scores (from 62 to 92, P < .05), function scores (from 52 to 83, P < .05), and range of motion (from 4 degrees -74 degrees to 0.6 degrees -98 degrees , P < .05). These results support the use of computer-assisted navigation as effective high technology instrumentation in recreating an acceptable mechanical axis in patients with distorted anatomical landmarks.
authors.affiliation: Department of Orthopaedic Surgery, Cleveland Clinic, Cleveland, OH 44195, USA.
authors.forename: John
authors.initials: J
authors.lastname: Bottros
authors.forename: Alison K
authors.initials: AK
authors.lastname: Klika
authors.forename: Ho H
authors.initials: HH
authors.lastname: Lee
authors.forename: John
authors.initials: J
authors.lastname: Polousky
authors.forename: Wael K
authors.initials: WK
authors.lastname: Barsoum
mesh_terms: D019645:Arthroplasty, Replacement, Knee / Q000295:instrumentation* / Q000379:methods; D005269:Femur / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D021621:Imaging, Three-Dimensional; D016916:Joint Deformities, Acquired / Q000000981:diagnostic imaging / Q000601:surgery*; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000502:physiology; D011474:Prosthesis Design; D011859:Radiography; D016059:Range of Motion, Articular; D025321:Surgery, Computer-Assisted; D013977:Tibia / Q000000981:diagnostic imaging / Q000601:surgery