MOVEMENT AT HIP JOINTALAMZEB

ROLL NO.09

Motion of the Pelvis on the FemurWhenever the hip joint is weight-bearing, the

femur is relatively fixed, and, in fact motion of the hip joint is produced by movement of the pelvis on the femur.

Anterior and Posterior Pelvic TiltAnterior and posterior pelvic tilt are motions of theentire pelvic ring in the sagittal plane around a coronalaxis.Anterior and posterior tilting of the pelvis on the fixed

femur results hip flexion and extension, respectively.

Anterior Pelvic Tilt: when ASIS moves anteriorly and inferiorly; while PSIS moves anteriorly and superiorly. The symphysis pubis moves downward and sacrum moves away from the femur.

Posterior Pelvic Tilt: when ASIS moves posteriorly and superiorly; while PSIS moves posteriorly and inferiorly. The symphysis pubis moves upward and sacrum moves towards the femur.

Lateral Pelvic Tilt:Lateral pelvic tilt is a frontal plane motion of

the entire pelvis around an anteroposterior axis.

If a person stands on the left limb and hikes the pelvis, the left hip joint is being abducted because the medial angle between the femur and a line through the ASISs increases. If a person stands on the left leg and drops the pelvis, the left hip joint will adduct because the medial angle formed by the femur and a line through the ASISs will decrease.

Anterior and Posterior Pelvic Rotation:Pelvic rotation is motion of the entire pelvic ring in

the transverse plane around a vertical axis.Occurs in both unilateral and bilateral stance.Forward rotation of the pelvis occurs in unilateral

stance when the side of the pelvis opposite to the supporting hip joint moves anteriorly. Forward rotation of the pelvis produces medial rotation of the supporting hip joint.

Backward rotation of the pelvis occurs when the side of the pelvis opposite the supporting hip moves posteriorly. Posterior rotation of the pelvis produces lateral rotation of the supporting hip joint.

Pelvic rotation