Which ligament primarily supports the anterior aspect of the hip joint?

The iliofemoral ligament is the correct choice because it is the strongest ligament of the hip joint and plays a crucial role in providing stability, particularly on the anterior aspect. This ligament extends from the ilium to the femur and helps prevent hyperextension of the hip when standing. Its structure allows it to effectively resist downward forces and maintain the alignment of the joint during movement.

The other ligaments serve different functions: the ischiofemoral ligament primarily supports the posterior aspect of the joint, while the pubofemoral ligament aids in limiting excessive abduction and external rotation. The transverse acetabular ligament connects the two sides of the acetabular notch, but it does not primarily provide anterior support. Therefore, the iliofemoral ligament is the primary support for the anterior aspect of the hip joint, making it the correct answer.