Which ligament provides stability during hip extension and adduction?

The ischiofemoral ligament is essential for providing stability during hip extension and adduction. This ligament is located on the posterior aspect of the hip joint and plays a critical role in preventing excessive movement that could lead to joint instability. It helps to maintain the integrity of the hip joint, especially when the hip is in an extended position or moving into adduction.

When the hip extends, the ischiofemoral ligament becomes taut, thus resisting the forces that might cause abnormal movement of the femoral head within the acetabulum. This resistance is particularly important during activities that require strength and stability, such as running or jumping, where the hip is often found in an extended position.

In contrast, other ligaments mentioned, like the iliofemoral ligament, primarily support hip flexion and resist extension, while the pubofemoral ligament is more involved in stabilizing the hip during abduction and external rotation. The ligamentum teres primarily serves as a conduit for blood vessels to the femoral head and does not significantly contribute to the stability of the hip during the mentioned movements.