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      Kinematic Analysis of Total Knee Arthroplasty using Verasense: Genesis-II prosthesis versus Anthem prosthesis

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          Abstract

          Purpose

          The purpose of this study was to elucidate kinematic change according to the implant’s specific femoral rotation by using orthosensor (Verasense) implant with three degrees external rotation of femoral rotation rebuilt (Genesis-II) and traditional TKA implant without rebuilt of the femoral rotation (Anthem).

          Methods

          Twenty-eight patients (34 knees) underwent TKA using Anthem (Smith &Nephew, Memphis, TN, USA) and 16 patients (22 knees) underwent TKA using Genesis-II (Smith & Nephew, Memphis, TN, USA). Patients were followed up for at least 1 year. Mean age of patients was 71.1 years (range, 60 to 80 years) at the time of surgery. After implantation of femur and tibial components, we applied Verasense, the orthosensor system, to evaluate femoral rollback of the new artificial joint. Femoral rollback was analyzed using digitized screenshot function of Verasense.

          Results

          Overall femoral tracking proportion regardless of implants was significantly higher on the medial compartment compared to that on the lateral compartment (13.3 ±8.4% vs. 6.3 ± 5.0%, p < 0.001). Regarding femoral tracking according to each compartment, Genesis-II and Anthem showed 12.1 ± 8.2% and 14.2 ± 8.6% ( p = 0.371) on the medial compartment and 8.0 ± 5.8% and 5.2 ± 4.2% ( p = 0.059) on the lateral compartment, respectively.

          Conclusion

          Our study showed reverse femoral roll-back movement with higher tracking distance on the lateral compartment during TKA. Genesis-II TKA system with femoral component 3-degree rebuilt showed less roll-back difference between medial and lateral compartments compared to traditional TKA system. Fortunately, both TKA systems had excellent short-term clinical outcomes without having significant difference between the two. With longer follow-up and larger cohort, the advantage and effectiveness of femoral component rotation can be elucidated in the future.

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          Author and article information

          Journal
          Orthop J Sports Med
          Orthop J Sports Med
          OJS
          spojs
          Orthopaedic Journal of Sports Medicine
          SAGE Publications (Sage CA: Los Angeles, CA )
          2325-9671
          29 May 2020
          May 2020
          : 8
          : 5 suppl5 , Combined 6th IHKS, APKS, and APIS 2019 Scientific Meeting Abstracts
          Affiliations
          [1-2325967120S00107]Chonnam National University Bitgoeul Hospital, South Korea
          Article
          10.1177_2325967120S00107
          10.1177/2325967120S00107
          7268129
          1101ee4c-86eb-4e34-8e6b-0f62325bb912
          © The Author(s) 2020

          This open-access article is published and distributed under the Creative Commons Attribution - NonCommercial - No Derivatives License ( https://creativecommons.org/licenses/by-nc-nd/4.0/), which permits the noncommercial use, distribution, and reproduction of the article in any medium, provided the original author and source are credited. You may not alter, transform, or build upon this article without the permission of the Author(s). For article reuse guidelines, please visit SAGE’s website at http://www.sagepub.com/journals-permissions.

          Categories
          Article
          Custom metadata
          corrected-proof
          ts3

          total knee arthroplasty,verasense,kinematic analysis,femoral roll-back

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