Hip Joint - continued
The pelvic-girdle allows movement in 3 planes.
Movement at the pelvis typically involves movement
at hip and lumbar spine. PELVIS ALSO facilitates movement of FEMUR by rotating to position ACETABULUM in direction of pending movement
Sagittal Plane Movement:
-Anterior Pelvic Tilt = Posterior Sacral Tilt (sacral counternutation): pubis symphisis moves inferiorly, lumbar spine extends and hips flex = increased lumbosacral angle. For GAIT, ASIS moves forwards with respect to acetabulum, head of femur placed behind hipbone to permit femoral extension.
-Posterior Pelvic Tilt = Anterior Sacral Tilt (sacral nutation): pubis symphisis moves superiorly, lumbar spine flexes and hips extend=decreased lumbosacral angle. For GAIT, ASIS moves backwards with respect to acetabulum, head of femur placed in front of hipbone to permit flexion.
Frontal Plane Movement:
-Lateral tilt of pelvis
Transverse Plane Movement:
– Rotation of pelvis