Posterior views of the deep lateral rotator group (including the piriformis)

Muscles of the Pelvis

Pelvic musculature: 1. cross the LS joint onto the trunk 2. cross the hip joint onto the thigh/leg 3. pelvic floor muscles located wholly within the pelvis

Rectus Femoris: Get it Straight!

As a hip flexor, it is an extremely important muscle, both functionally and dysfunctionally. When tight, its pull is exerted in closed-chain function with anterior tilt of the pelvis; excessive anterior tilt can then create excessive lumbar lordosis (a postural distortion pattern known as lower crossed syndrome), which often predisposes toward low back pain.