When performing hip abduction with a relatively fixed pelvis, what direction doe

Question

When performing hip abduction with a relatively fixed pelvis, what direction does the femur roll and glide within the femoracetabular joint?

A. Identify the bone(s) that makes up the convex surface of the joint.

B. Identify the bone(s) that makes up the concave surface of the joint.

C. Select the appropriate rule to apply and provide a brief description as to why you made your selection.

D. Identify the direction the femur is rolling and provide a brief explanation as to how you came to this answer.

E. Identify the direction the femur is gliding and provide a brief explanation as to how you came to this answer.

Explanation / Answer

# Hip abduction is the movement of the leg away from the midline of the body.The hip abductor muscles include the gluteus medius,gluteus minimus and tensor fascia lata(TFL).

Joint involved: hip joint

plane of motion: frontal plane

axis of rotation: a sagittal axis passing through the center of head of the femur osteokinematic movements.

Hip abduction:inferior glide of the femoral head of the acetabulum

# HIP JOINT:concave acetabulum articulates with the convex femoral head.

hip posterior glide increases flexion and internal rotation

# When the convex head of the femur articulates with the fix concave surface of the acetabulam during open chain hip flexion,the femoral head rolls superiorly and slides inferiorly.As the mobile,concave surface of the acetabulam moves while the convex surface of the femoral head is fixed,the two entities roll and glide in the same direction.

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