McGregor et al.9)
reported that,
to compensate for the weakening of the abdomen and the
back, low-back pain patients adopt rounded-back postures
with flexion of the hip, knee, and ankle joints, and that lesions
in the lumbopelvic region cause the weakening and
tension of the muscles surrounding the hip joint. Van Dillen
et al.10)
reported that limitation of hip range of motion of
low-back pain patients was significantly different from that
of healthy persons. When presenting a theory that low-back
pain patients’ trunk flexion causes excessive movement
of the lumbar spine in the sagittal plane due to the limitation
of hip joint internal rotation, McConnell11)
reported a
tendency toward internal rotation of the hip joint due to the
gluteus medius muscle’s hypofunction and iliotibial tract’s
shortening. Neumann et al.12)
claimed that hypofunction of
the gluteus medius muscle would cause lumbopelvic region
instability