Mobile medial pivot (lateral slide) type total knee arthroplasty exhibits a medial pivot pattern: three-dimensional motion analysis using cadaveric knees

Journal of Experimental Orthopaedics

Original Paper

Go Omori¹  Takashi Sato²  Satoshi Watanabe²  Hiroyuki Kawashima³  Osamu Tanifuji³  Tomoharu Mochizuki³ 

[1] Department of Health and Sports, Faculty of Health Sciences, Niigata University of Health and Welfare, Niigata, Japan;Department of Orthopaedic Surgery, Niigata Medical Center, Niigata, Japan;Division of Orthopaedic Surgery, Department of Regenerative and Transplant Medicine, Niigata University Graduate School of Medicine and Dental Science, 1-757 Asahimachi-Dori Chuo-Ku, 951-8510, Niigata, Japan;

关键词: Total knee arthroplasty;    Knee kinematics;    Mobile-bearing;    Medial pivot;    Three-dimensional to two-dimensional registration technique;   

DOI  :  10.1186/s40634-022-00558-9

 received in 2022-07-31, accepted in 2022-11-30,  发布年份 2022

来源: Springer

【 摘 要 】

PurposeThe purpose of this study was to analyze the dynamic kinematics of the mobile medial pivot-type total knee arthroplasty (MMPTKA) using the three-dimensional (3D)-to-2D registration technique.MethodsCadaveric knees from five humans were used. Computed tomography of the lower limb and preoperative 3D planning for MMPTKA were performed. After performing TKA, passive motion of the knee was observed from a fully extended position to maximum flexion using a flat panel detector. The following parameters were determined: (1) anteroposterior (AP) translations of the medial and lateral most distal points (estimated contact point) of the femoral component, (2) rotational femoral component’s X-axis (FCX) angle, and (3) rotational insert angle. Paired t-tests were used to analyze differences in the AP translation between the medial and lateral most distal points of the femoral component as well as differences in the changes in the rotational angle between the FCX and X-axis of the insert on the tibial component’s axial plane.ResultsThe AP translations of the femoral component’s medial and lateral most distal points were 8.4 ± 2.5 and 13.6 ± 3.3 mm, respectively (p = 0.001). The rotational angles of the FCX and insert were 10.7° ± 4.9° external rotation and 8.9° ± 4.1° internal rotation, respectively (p = 0.004).ConclusionsThe posterior translation of the lateral side of the femoral component was greater than that of the medial in all cases. Hence, a medial pivot pattern was identified. The femoral component exhibited external rotation throughout knee flexion in all subjects, whereas the mobile insert exhibited internal rotation (opposite pattern relative to the femoral component). This study provides valuable kinematical information of MMPTKA that has not been clear yet.

【 授权许可】

CC BY   
© The Author(s) 2022

【 图 表 】

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