The functions of the quadratus lumborum muscle
are a mystery. This muscle lies lateral to the lumbar
spine and connects the ilium to the twelfth rib and to
the lumbar vertebrae. Because of its costal attachment,
anatomists have accorded it a role in respiration
[1, 2] and, because of its vertebral attachments,
they have accorded it a function in moving the
lumbar spine [1, 2]. Confidently they stated that
quadratus lumborum causes lateral flexion, but
uncertainty applies to extension. Anatomy texts state
that the quadratus lumborum ‘probably helps to
extend’ [1] or ‘may extend’ [2] the lumbar spine.
Bioengineers have found the muscle to be active
during a variety of lumbar movements, including
extension, and have concluded that it is an important
stabilizer of the lumbar spine [3–6].
The functions of the quadratus lumborum muscleare a mystery. This muscle lies lateral to the lumbarspine and connects the ilium to the twelfth rib and tothe lumbar vertebrae. Because of its costal attachment,anatomists have accorded it a role in respiration[1, 2] and, because of its vertebral attachments,they have accorded it a function in moving thelumbar spine [1, 2]. Confidently they stated thatquadratus lumborum causes lateral flexion, butuncertainty applies to extension. Anatomy texts statethat the quadratus lumborum ‘probably helps toextend’ [1] or ‘may extend’ [2] the lumbar spine.Bioengineers have found the muscle to be activeduring a variety of lumbar movements, includingextension, and have concluded that it is an importantstabilizer of the lumbar spine [3–6].
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