Abstract
[Purpose] The effect on the standing posture of healthy infants w-sitting on a daily basis was investigated in this study. [Subjects] The guardians of 39 healthy infants aged 3–6 year were interviewed about their sitting posture. [Methods] The angle formed by the horizontal line and the line connecting the two points of the iliac spine and the anterior superior iliac spine was measured as the pelvic tilt angle. Hip rotation was classified into five groups using posture analysis. [Results] In children exhibiting w-sitting, an association was found between pelvic forward tilt and hip internal rotation. [Conclusion] With daily w-sitting, a standing posture exhibiting hip internal rotation with forward pelvis tilt is easily adopted even by children showing routine development. This may increase the risk of orthopedic disease, damage to the anterior cruciate ligament, or back pain in the growth process.
