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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)665-670
Number of pages6
JournalJournal of Orthopaedic Research
Issue number3
Publication statusPublished - 2004
Externally publishedYes


  • Dislocation
  • Motion analysis
  • Total hip arthroplasty

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine


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