Effect of tibial component alignment on knee kinematics and ligament tension in medial unicompartmental knee arthroplasty

Bone & Joint Research

article

K. Sekiguchi¹  S. Nakamura¹  S. Kuriyama¹  K. Nishitani¹  H. Ito¹  Y. Tanaka¹  M. Watanabe¹  S. Matsuda¹ 

[1] Department of Orthopedic Surgery, Kyoto University, Graduate School of Medicine;Medical Staff, Yawata Central Hospital

关键词: Unicompartmental knee arthroplasty;    Alignment;    Kinematics;    Kinetics;    Computer simulation;   

DOI  :  10.1302/2046-3758.83.BJR-2018-0208.R2

学科分类：骨科学

来源: British Editorial Society Of Bone And Joint Surgery

【 摘 要 】

ObjectivesUnicompartmental knee arthroplasty (UKA) is one surgical option for treating symptomatic medial osteoarthritis. Clinical studies have shown the functional benefits of UKA; however, the optimal alignment of the tibial component is still debated. The purpose of this study was to evaluate the effects of tibial coronal and sagittal plane alignment in UKA on knee kinematics and cruciate ligament tension, using a musculoskeletal computer simulation.MethodsThe tibial component was first aligned perpendicular to the mechanical axis of the tibia, with a 7° posterior slope (basic model). Subsequently, coronal and sagittal plane alignments were changed in a simulation programme. Kinematics and cruciate ligament tensions were simulated during weight-bearing deep knee bend and gait motions. Translation was defined as the distance between the most medial and the most lateral femoral positions throughout the cycle.Results7° posterior slope model and the 0° model.Conclusion4° or valgus alignment and excessive posterior slope caused excessive ML translation, which could be related to feelings of instability and could potentially have negative effects on clinical outcomes and implant durability.

【 授权许可】

CC BY-NC