Validation of a new model-based tracking technique for measuring three-dimensional, in vivo glenohumeral joint kinematics
Validation of a new model-based tracking technique for measuring three-dimensional, in vivo glenohumeral joint kinematics
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DOI：
10.1115/1.2206199
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发表时间：
2006-08-01
影响因子：
1.7
通讯作者：
Tashman, Scott
中科院分区：
文献类型：
--
作者：
Bey, Michael J.;Zauel, Roger;Tashman, Scott
肩关节运动是复杂的，重要的研究工作集中在测量盂肱关节运动。不幸的是，传统的运动测量技术不能测量盂肱关节运动学在动态肩关节运动到临床上显著水平的准确性。本研究的目的是验证一种新的基于模型的跟踪技术测量三维，在体内盂肱关节运动学的准确性。我们已经开发了一种基于模型的跟踪技术，用于从双平面射线照相图像中准确测量体内关节运动，该双平面射线照相图像根据骨骼的三维形状和纹理跟踪骨骼的位置。为了验证这种技术，我们植入钽珠到肱骨和肩胛骨的两个肩膀从三具尸体标本，然后记录双平面射线图像的肩膀，同时手动移动每个标本的arm. The肱骨和肩胛骨的位置进行测量，使用基于模型的跟踪系统，并与先前验证的动态放射立体分析（RSA）技术。通过将基于模型的跟踪结果与动态RSA结果进行比较，报告了测量偏差、测量精度和整体动态精度方面的准确度。基于模型的跟踪技术产生的结果与RSA技术非常一致。肩胛骨的测量偏差范围为-0.126至0.199 mm，肱骨的测量偏差范围为-0.022至0.079 mm。肩胛骨动态测量精度优于0.130 mm，肱骨动态测量精度优于0.095 mm。总体动态精度表明，肩胛骨和肱骨在任何一个方向上的均方根误差均小于0.385 mm和0.374 mm。这些误差对应于肩胛骨约0.25度和肱骨约0.47度的旋转误差。这种新的基于模型的跟踪方法代表了一种非侵入性技术，用于在体内条件下准确测量动态盂肱关节运动。基于模型的技术实现的精度水平，远远超过所有以前报道的非侵入性技术测量在体内盂肱关节运动。该技术得到了严格的验证研究的支持，该研究提供了体内条件的真实模拟，我们完全期望通过体内人体测试达到这些准确度水平。未来的研究将使用这种技术来分析各种测试条件下的肩关节运动，并调查保守和手术治疗肩袖撕裂对动态关节稳定性的影响。
Shoulder motion is complex and significant research efforts have focused on measuring glenohumeral joint motion. Unfortunately, conventional motion measurement techniques are unable to measure glenohumeral joint kinematics during dynamic shoulder motion to clinically significant levels of accuracy. The purpose of this study was to validate the accuracy of a new model-based tracking technique for measuring three-dimensional, in vivo glenohumeral joint kinematics. We have developed a model-based tracking technique for accurately measuring in vivo joint motion from biplane radiographic images that tracks the position of bones based on their three-dimensional shape and texture. To validate this technique, we implanted tantalum beads into the humerus and scapula of both shoulders from three cadaver specimens and then recorded biplane radiographic images of the shoulder while manually moving each specimen's arm. The position of the humerus and scapula were measured using the model-based tracking system and with a previously validated dynamic radiostereometric analysis (RSA) technique. Accuracy was reported in terms of measurement bias, measurement precision, and overall dynamic accuracy by comparing the model-based tracking results to the dynamic RSA results. The model-based tracking technique produced results that were in excellent agreement with the RSA technique. Measurement bias ranged from -0.126 to 0.199 mm for the scapula and ranged from -0.022 to 0.079 mm for the humerus. Dynamic measurement precision was better than 0.130 mm for the scapula and 0.095 mm for the humerus. Overall dynamic accuracy indicated that rms errors in any one direction were less than 0.385 mm for the scapula and less than 0.374 mm for the humerus. These errors correspond to rotational inaccuracies of approximately 0.25 deg for the scapula and 0.47 deg for the humerus. This new model-based tracking approach represents a non-invasive technique for accurately measuring dynamic glenohumeral joint motion under in vivo conditions. The model-based technique achieves accuracy levels that far surpass all previously reported non-invasive techniques for measuring in vivo glenohumeral joint motion. This technique is supported by a rigorous validation study that provides a realistic simulation of in vivo conditions and we fully expect to achieve these levels of accuracy with in vivo human testing. Future research will use this technique to analyze shoulder motion under a variety of testing conditions and to investigate the effects of conservative and surgical treatment of rotator cuff tears on dynamic joint stability.