一种独特的后稳定型膝关节植入物在步行运动中的体内运动学。
In vivo kinematics of a unique posterior-stabilized knee implant during a stepping exercise.
作者信息
Mine Takatomo, Hoshi Kenji, Gamada Kazuyoshi, Ihara Koichiro, Kawamura Hiroyuki, Kuriyama Ryutaro, Date Ryo
机构信息
Department of Orthopaedic Surgery, National Hospital Organization Kanmon Medical Center, 1-1 ChofuUshiroda Simonoseki, Yamaguchi, 752-8510, Japan.
Department of Rehabilitation, Hiroshima International University, Hiroshima, Japan.
出版信息
J Orthop Surg Res. 2016 Feb 1;11:18. doi: 10.1186/s13018-016-0354-5.
BACKGROUND
Stair-stepping motion is important in daily living, similar to gait. Knee prostheses need to have even more superior performance and stability in stair-stepping motion than in gait. The purpose of this analysis was to estimate in vivo knee motion in stair stepping and determine if this unique knee prosthesis function as designed.
METHODS
A total of 20 patients with Bi-Surface posterior-stabilizing (PS) implants were assessed. The Bi-Surface PS knee is a posterior-cruciate substitute prosthesis with a unique ball-and-socket joint in the mid-posterior portion of the femoral and tibial components. Patients were examined during stair-stepping motion using a 2-dimensional to 3-dimensional registration technique.
RESULTS
The kinematic pattern in step up was a medial pivot, in which the level of anteroposterior translation was very small. In step down, the kinematic pattern was neither a pivot shift nor a rollback. From minimum to maximum flexion, anterior femoral translation occurred slightly.
CONCLUSIONS
In this study, this unique implant had good joint stability during stair stepping. The joint's stability during stair stepping was affected by the design of the femorotibial joint rather than post/cam engagement or the ball-and-socket joint.
背景
阶梯运动在日常生活中很重要，类似于步态。膝关节假体在阶梯运动中需要比在步态中具有更卓越的性能和稳定性。本分析的目的是评估阶梯运动中膝关节的体内运动，并确定这种独特的膝关节假体是否按设计发挥功能。
方法
共评估了20例使用双表面后稳定型（PS）植入物的患者。双表面PS膝关节是一种后交叉韧带替代假体，在股骨和胫骨部件的中后部有独特的球窝关节。使用二维到三维配准技术在患者进行阶梯运动时进行检查。
结果
上台阶时的运动模式是内侧旋转，前后平移程度非常小。下台阶时，运动模式既不是旋转移位也不是后滚。从最小屈曲到最大屈曲，股骨有轻微的向前平移。
结论
在本研究中，这种独特的植入物在阶梯运动期间具有良好的关节稳定性。阶梯运动期间关节的稳定性受胫股关节设计的影响，而非柱/凸轮啮合或球窝关节的影响。
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