A novel system of four-dimensional motion analysis after total hip arthroplasty

Keisuke Hagio*, Nobuhiko Sugano, Takashi Nishii, Hidenobu Miki, Yoshito Otake, Asaki Hattori, Naoki Suzuki, Kazuo Yonenobu, Hideki Yoshikawa, Takahiro Ochi

*この研究の対応する著者

研究成果: Article査読

30 被引用数 (Scopus)

抄録

We have developed a novel system of four-dimensional motion analysis after total hip arthroplasty (THA) that can aid in preventing dislocation by assessing safe range of motion for patients in several daily activities. This system uses skeletal structure data from CT and motion capture data from an infrared position sensor. A 3-D model reconstructed from CT data is combined with the motion capture data. Using this system, we analyzed hip motion when getting up from and sitting down in a chair or picking up an object while sitting in a chair in 17 patients (26 hips) who underwent THA. To assess the accuracy of this system's measurements, open MRI was used to evaluate positions of skin markers against bones in five healthy volunteers in various postures. No impingement between bones and/or implants was found in any subjects during any activities. However, mean angle at the point of maximum hip flexion was different for each patient. The open MRI results indicated that average error in hip angle of the present system was within 5° for each static posture.The functional position of the pelvis during daily activities must be taken into account when assessing the real risk of dislocation. The present system enables dynamic analysis involving not only alignment of components and bones of each patient, but also individual differences in characteristics of daily motions. Further investigation using this system can help determine safe ranges of motion for preventing hip dislocation, improving the accuracy of individualized guidance for patients regarding postoperative activities.

本文言語English
ページ(範囲)665-670
ページ数6
ジャーナルJournal of Orthopaedic Research
22
3
DOI
出版ステータスPublished - 2004
外部発表はい

ASJC Scopus subject areas

  • 整形外科およびスポーツ医学

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