Three-Dimensional Limping Gait Analysis in Patients with Hip Diseases: The Significance of the Dynamic EMG Frequency Characteristic of the Gluteus Medius Muscle to Pelvic Tilt, Pelvic Rotation, and Lateral Displacement of the Pelvis

DOI 6 Citations 11 References
  • KATOH Hiroshi
    Department of Physical Therapy, Sciences Major, Graduate School of Health Science, Kibi of Medical Science, International University : Health Science Major,Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Hiroshima University
  • JlNGUSHI Seiya
    Department of Orthopaedic Graduate school of Medical Science, Kyushu University
  • IWAMOTO Yukihide
    Department of Orthopaedic Graduate school of Medical Science, Kyushu University
  • SHINKODA Koichi
    Institute of Health Sciences, Faculty of Medicine, Hiroshima University
  • YOSHIMURA Osamu
    Institute of Health Sciences, Faculty of Medicine, Hiroshima University

Bibliographic Information

Other Title
  • 股関節疾患患者の三次元跛行解析
  • ―骨盤傾斜角・回旋角・側方移動距離に対する中殿筋の動的EMG周波数特性の意義―

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Abstract

A study was performed to investigate the pelvic sway from the dynamic EMG frequency characteristic (MPFR), muscle tissue morphology, and the maximum isometric hip abductor torque. The subjects were 13 patients with hip disease who underwent surgery at Kyushu University Medical Hospital and 10 healthy persons. Before surgery, the maximum isometric hip abductor torque was measured. The electrodes were placed on the belly of the gluteus medius muscle on the operative side (or on the right side in healthy persons), and reflective markers were placed on the anterior superior iliac spine on both sides of the pelvis. Then, dynamic EMG frequency analysis (wavelet time-frequency analysis) and three-dimensional motion analysis (pelvic tilt angle in the frontal plane, pelvic rotation angle, and lateral displacement of the pelvis in the horizontal plane) were conducted concurrently during a 10-m free walk. A biopsy specimen was taken from the belly of the gluteus medius muscle at the time of surgery, and the muscle fiber type was classified by ATPase staining. Furthermore, the muscle fiber diameter of type I and type II fibers were measured by using image processing software (NIH image). It was found that there was a significant positive correlation between the MPFR and the diameter of type II fibers or the walking ability score (JOA hip score) in the patients. The pelvic tilt angle and pelvic rotation angle were deviated significantly from the normal base as compared with the healthy persons. Moreover, multiple regression analysis showed that the maximum isometric hip abductor torque and MPFR were important regulatory factors of the pelvic tilt angle in the frontal plane.

Journal

  • Physical Therapy Japan

    Physical Therapy Japan 31 (7), 426-432, 2004-12-20

    Japanese Society of Physical Therapy

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