Determination of the accuracy of navigated kinematic unicompartmental knee arthroplasty: a 2-Year follow-up

Grant, Andrea L., Doma, Kenji D., and Hazratwala, Kaushik (2017) Determination of the accuracy of navigated kinematic unicompartmental knee arthroplasty: a 2-Year follow-up. Journal of Arthroplasty, 32 (5). pp. 1443-1452.

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Background: Unicompartmental knee arthroplasty (UKA) lacks history of patient satisfaction and research addressing technique validity. The aim of this study was to determine minimally invasive navigated kinematic UKA accuracy by comparing postoperative limb alignment with preoperative stress values.

Methods: A single-center retrospective study was conducted on 53 consecutive patients (postoperative alignment: varus n = 51, valgus n = 2) who underwent computer navigation assisted UKA. Two patient groups (A and B) predetermined by joint deformity cut-off points (B included valgus deformity) underwent preoperative magnetic resonance imaging and x-ray evaluation to assess limb alignment and exclude lateral and patellofemoral osteoarthritis. Preoperative and postoperative joint alignment, stress value, and range of movement were recorded with navigation. Outcome measures include comparison of postoperative alignment to the preoperative stress values for varus and valgus postoperative alignment groups and preoperative and/or postoperative Western Ontario and McMaster Universities and Knee Society Score evaluations.

Results: Minor systematic bias was found between stress value and postoperative alignment; however, the magnitude of difference was clinically acceptable. Score evaluations, prosthesis size or alignment didn't differ between groups. Furthermore, there was no significant increase in range of movement at 2 years. There was a high degree of agreement between stress value and postoperative alignment values suggesting strong validity for the surgical technique to determine optimal postoperative alignment.

Conclusion: This study validates our surgical technique. Minimally invasive navigated UKA allows us to predict predisease alignment and recreates it with high accuracy. Our clinical results at 2 years are comparable with other published data.

Item ID: 50702
Item Type: Article (Research - C1)
ISSN: 0883-5403
Keywords: partial knee, validity, medial compartment, minimally invasive, responsiveness
Date Deposited: 20 Sep 2017 11:09
FoR Codes: 32 BIOMEDICAL AND CLINICAL SCIENCES > 3202 Clinical sciences > 320216 Orthopaedics @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970111 Expanding Knowledge in the Medical and Health Sciences @ 100%
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