Effect of sagittal femoral component alignment on biomechanics after mobile-bearing total knee arthroplasty

Journal of Orthopaedic Surgery and Research

Kyoung-Tak Kang¹  Jin-Ah Lee¹  Hwa-Yong Lee¹  Hyo-Jeong Kim²  Yong-Gon Koh³  Dong-Suk Suh³ 

[1] Department of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, 03722, Seoul, Republic of Korea;Department of Sport and Healthy Aging, Korea National Sport University, 1239 Yangjae-dearo, Songpa-gu, 05541, Seoul, Republic of Korea;Joint Reconstruction Center, Department of Orthopaedic Surgery, Yonsei Sarang Hospital, 10 Hyoryeong-ro, Seocho-gu, 06698, Seoul, Republic of Korea;

关键词: Total knee arthroplasty;    Mobile-bearing;    Malalignment;    Finite element analysis;   

DOI  :  10.1186/s13018-019-1458-5

来源: Springer

【 摘 要 】

BackgroundRecently, there has been increasing interest in mobile-bearing total knee arthroplasty (TKA). However, changes in biomechanics with respect to femoral component alignment in mobile-bearing TKA have not been explored in depth. This study aims to evaluate the biomechanical effect of sagittal alignment of the femoral component in mobile-bearing TKA.MethodsWe developed femoral sagittal alignment models with − 3°, 0°, 3°, 5°, and 7°. We also examined the kinematics of the tibiofemoral (TF) joint, contact point on the TF joint, contact stress on the patellofemoral (PF) joint, collateral ligament force, and quadriceps force using a validated computational model under a deep-knee-bend condition.ResultsPosterior kinematics of the TF joint increased as the femoral component flexed. In addition, contact stress on the PF joint, collateral ligament force, and quadriceps force decreased as the femoral component flexed. The results of this study can assist surgeons in assessing risk factors associated with femoral component sagittal alignment for mobile-bearing TKA.ConclusionsOur results showed that slight flexion implantation may be an effective alternative technique because of its advantageous biomechanical effect. However, excessive flexion should be avoided because of potential loosening of the TF joint.

【 授权许可】

CC BY