Quadratus lumborum pain involves discomfort in the muscle that is located deep in the lower back on both sides of the spine. The quadratus lumborum muscle starts at the pelvis and runs up to the ...

Pain in the quadratus lumborum can be due to overuse, stress, and strain. Sometimes muscles cause pain and stiffness when they’re weak or too tight. Activities such as sitting for long periods ...

Objective In this study, asymmetry relative to the preferred kicking leg was determined if it exists for the psoas and quadratus lumborum muscles among elite Australian Football League (AFL) players.