2016 Volume 19 Issue 2 Pages 86-91
It has been observed there is height difference on the left and right sides of the pelvis in sitting position of one-sided hip flexion limitation cases. However, there is little report on the relationship between the left and right height difference of the pelvis and one-sided hip flexion limitation in sitting position. Thus, this study investigated the relationship of the height difference between the left and right pelvis and the one-sided hip flexion limitation cases in sitting position. The subjects were 9 individuals with one side total hip arthroplasty. In sitting position, subjects were photographed from frontal plane. From the taken image, the lateral pelvic tilt angle was measured using rysis（ sitting posture measurement software）. Then, the left and right height difference of anterior superior iliac spine（ ASIS） was calculated［ ASIS height difference＝ASIS distance×sin（ the lateral pelvic tilt angle）］. Correlation analysis between ASIS height difference and 80- the limited side hip flexion angle was performed. As a result, a strong correlation between the limited side hip flexion angle and ASIS height difference（ r＝0.8, p＜0.05） was found. This study showed that one-sided hip flexion limitation leads to the elevation of the limited side pelvis in sitting position. There is a possiblity that one-sided hip flexion limitation in sitting position contributes to the concentration of pressure on one side of the ischium.
