頁籤選單縮合
題 名 | On the Estimation of Hip Joint Centre Position in Clinical Gait Analysis |
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作 者 | Lu,Tung-wu; | 書刊名 | 醫學工程 |
卷 期 | 12:2 2000.04[民89.04] |
頁 次 | 頁89-95 |
分類號 | 416.61 |
關鍵詞 | Hip joint centre; Gait analysis; Functional methods; Computer simulation; Skin movement aretefacts; |
語 文 | 英文(English) |
英文摘要 | Accurate determination of the positions of the joint centres in the lower extremities is essential in clinical gait analysis because it affects the accuracy of the calculated joint moments. Compared to the knee and ankle, the hip joint centre (HJC) is difficult to identify with palpable bony landmarks because it lies deep between the pelvis and thigh. Two methods are available for noninvasive estimation of the HJC position: prediction method and functional method. Although they have been widely used in clinical gait analysis, controversy still exists regarding their accuracy and clinical implications. In the present study, a new method that incorporated explicitly rigid body kinematics and considered skin movement artefacts was developed. In vivo data from roentgen stereophotogrammetric analysis (RSA) and video-based motion analysis as well as data from computer experiments were used to evaluate the new method and the other two traditional methods. The prediction method predicted the HJC position with an error of 16mm, taking the position determined by the RSA as the true value. The corresponding errors for the traditional functional method ranged from 7mm to 83mm with different tracking markers, suggesting that the accuracy of the tratitional functional method was significantly affected by the choice of the tracking marker and the test motion. In contrast, the new method estimated the HJC position by minimising the overall skin movement artefacts in the pelvis and leg so the result was not dependent on the choice of a single tracking marker. Considering thigh and shank segments together, the new method predicted results with errors less than 12 mm regardless of the type of the test motion. With the knee properly kept in extended position during test motion, the new method may be a reliable technique for routine clinical gait analysis. |
本系統中英文摘要資訊取自各篇刊載內容。