The arthrokinematic action of the femoral head during hip extension is characterized by which roll and glide?

• A. posterior roll, anterior glide
• B. anterior roll, posterior glide
• C. superior roll, inferior glide
• D. superior roll, posterior glide

Answer: (A)

During hip extension, the femoral head undergoes specific arthrokinematic movements. As the thigh moves posteriorly, the femoral head rolls posteriorly while simultaneously gliding anteriorly. This combination of movements allows for the continued congruence and stability of the hip joint throughout the extension motion.

The posterior roll is essential as the convex surface of the femoral head needs to roll backward on the concave surface of the acetabulum. At the same time, the anterior glide prevents impingement and helps maintain joint integrity, allowing for a smooth and controlled range of motion during hip extension. This coordinated motion is critical for optimal functionality of the hip joint during activities like walking, running, and climbing. Understanding these movements helps clinicians and therapists apply appropriate techniques in rehabilitation and strengthening exercises for the hip.