Zaferiou Antonia M, Knowlton Christopher B, Jang Suk-Hwan, Saltzman Bryan, Verma Nikhil, Forsythe Brian, Nicholson Gregory, Romeo Anthony A
Department of Biomedical Engineering, Stevens Institute of Technology, Hoboken, NJ, USA; Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA.
Department of Orthopedic Surgery, Rush University Medical Center, Chicago, IL, USA.
J Biomech. 2020 Jul 17;108:109889. doi: 10.1016/j.jbiomech.2020.109889. Epub 2020 Jun 17.
The purpose of this study was to understand how each calibration pose affects scapular orientations measured by an Acromion Marker Cluster during scapular plane arm elevation performed by patients who had been pre-operatively indicated for Reverse Total Shoulder Arthroplasty. Eight pre-operative Reverse Total Shoulder Arthroplasty patients participated in this study while optical motion capture measured kinematics, specifically scapulothoracic angles and angular displacements, vs. humerothoracic elevation. The angle measurements were compared across the static calibration poses used to calculate them within-patient with One Dimensional Statistical Parametric Mapping paired t-tests and across-patients with a series of Sign Tests. The study uncovered patient-specificity in the effects of the Acromion Marker Cluster calibration pose on scapulothoracic angles and near linear offsets between the scapulothoracic upward rotation angles. The scapulothoracic upward rotation angular displacement measurements across calibration poses were within 5° of each other, suggesting nearly linear offsets between upward rotation angle measurements from each calibration pose. The Sign Tests revealed that using the Neutral calibration pose estimated significantly greater scapulothoracic protraction angles during arm elevation than did using the Hand to Back Pocket calibration pose (p = 0.02). Scapulothoracic protraction and posterior tilt measurements were near linear offsets between calibration poses only when humerothoracic elevation was less than 50°. Results encourage patient-specific and humerothoracic elevation-specific methods to combine calibration poses and the development of standards to report scapulothoracic orientations derived from using an Acromion Marker Cluster with multiple calibration poses.
本研究的目的是了解在术前已被确定适合进行反式全肩关节置换术的患者进行肩胛平面手臂抬高时，每种校准姿势如何影响由肩峰标记簇测量的肩胛方向。八名术前反式全肩关节置换术患者参与了本研究，同时光学运动捕捉测量了运动学，特别是肩胛胸壁角度和角位移与肱骨胸壁抬高的关系。使用一维统计参数映射配对t检验在患者内部比较了用于计算角度测量值的静态校准姿势之间的差异，并使用一系列符号检验在患者之间进行了比较。该研究发现，肩峰标记簇校准姿势对肩胛胸壁角度的影响存在患者特异性，并且肩胛胸壁向上旋转角度之间存在近似线性偏移。不同校准姿势下的肩胛胸壁向上旋转角位移测量值彼此相差不超过5°，这表明每个校准姿势的向上旋转角度测量值之间存在近似线性偏移。符号检验显示，在手臂抬高过程中，使用中立校准姿势估计的肩胛胸壁前伸角度明显大于使用手放于后口袋校准姿势时的估计值（p = 0.02）。仅当肱骨胸壁抬高小于50°时，肩胛胸壁前伸和后倾测量值在校准姿势之间才接近线性偏移。研究结果鼓励采用针对患者和肱骨胸壁抬高的特定方法来组合校准姿势，并制定标准以报告使用具有多种校准姿势的肩峰标记簇得出的肩胛方向。
