For example, a simple side stretch can open up the quadratus lumborum muscle and reduce the chance of an injury or spasm occurring. There are a number of quadratus lumborum stretch that can be used to help prevent low back pain. When the muscle is placed in an over-stretched and loaded position for a long period of time, it will eventually start to spasm, which can cause pain. Due to the muscle’s position, it often has to take over some of the excess strain from other muscles, which can result in fatigue. This is because the QL muscle attaches to both the spine and the pelvis and therefore is regularly involved in daily activities. ![]() ![]() The quadratus lumborum muscle is a common source for pain in the lower back. Due to the muscle’s involvement in a range of daily activities, it can commonly cause back pain and is often the subject of physical therapy. The muscle is also involved when a person lifts an object and helps to fix certain ribs during expiration. Its main action is to help flex the trunk of the body sideways and is involved in a large number of twisting activities. Its blood supply comes from the lumbar arteries. The origin is on the iliac crest, and the innervation is via the subcostal and lumbar nerves. From this point, it runs downward, although it also has attachment points on the L1-L4 bones of the spine. The insertion of the quadratus lumborum muscle is on the 12th rib and hence this is the rib it helps to fix during expiration.
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