Quadratus Lumborum, known as QL, is the deepest abdominal muscle. It is situated on each side of the lumbar spine in the lower back. It begins at the bottom of your ribcage and extends to the top of your pelvis. The QL muscle is a key piece of the core.

De Quervain tenosynovitis, also called gamer's thumb or mother's thumb, is a painful disorder that affects the tendons on the thumb side of the wrist. Tendons attach muscles to bones. A membrane-like structure called a tendon sheath surrounds the tendon, allowing the tendon to move freely inside of it. In De Quervain tenosynovitis, the sheaths