This study aimed to measure the thickness of the muscles located on the ventral side of the hip joint and to identify the muscles involved in exercise against the load that results in femoral head translation in the ventral direction, which can be used as an index of exercise performance for the prevention and improvement of hip joint disease caused by femoral head translation. [Participants and Methods] The participants were 10 healthy young males. During the measurement task, we asked them to hold a 10 kgf load in the ventral direction to the femoral head in the supine position. We measured the thickness of the gluteus minimus, gluteus medius, tensor fascia latae, and iliopsoas both at rest and during exercise using ultrasonography. [Results] We compared muscle thicknesses at rest and during exercise and found that only the gluteus minimus had significantly lower values during exercise. We also compared the rate of change in muscle thickness and found that the gluteus minimus exhibited significantly higher values than those of the gluteus medius and tensor fasciae latae. [Conclusion] Our study indicates that the gluteus minimus is more involved than the gluteus medius, tensor fasciae latae, and iliopsoas in the exercise for the ventral displacement of the femoral head.
The purpose of this study was to clarify the relationship between spinal curvature and hip joint angle during pelvic tilt movement in the sitting position. [Subjects] The subjects were 18 healthy adult males (mean age: 24.7±3.7). [Methods] We measured the pelvic tilt angle, hip joint angle, and spinal curvature (upper thoracic spine, lower thoracic spine and lumbar spine) during pelvic tilt movement with a three-dimensional motion analysis system. [Results] The hip flexion, the lower thoracic extension and the lumbar extension increased with increasing pelvic anterior tilt in the sitting position. The hip extension, lower thoracic flexion and lumbar flexion increased with pelvic posterior tilt. The movable range of pelvic tilt exhibited positive correlation with the movable range of the lower thoracic spine (anterior tilt: r=0.47, posterior tilt: r=0.54). [Conclusion] The pelvis movement and the hip and spine motion influenced each other. The results suggest that the movable range of pelvic tilt is required to maintain spinal mobility, because there was a positive correlation between the movable range of the pelvic tilt and that of the lower thoracic spine.
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