Which muscle is considered a prime mover for hip abduction and internal rotation?

The tensor fasciae latae is recognized as a prime mover for hip abduction and internal rotation due to its anatomical positioning and function. Located on the lateral aspect of the hip, this muscle plays a crucial role in moving the thigh away from the midline, which is the primary action of abduction. Additionally, the tensor fasciae latae contributes to internal rotation of the hip when the leg is in a flexed position. Its unique attachment to the iliotibial band further aids in stabilizing the pelvis during activities such as walking or running, enhancing its role in both abduction and internal rotation.

Other muscles mentioned, such as the gluteus maximus, primarily assist with hip extension and lateral rotation rather than abduction. The iliopsoas is primarily responsible for hip flexion, and the adductor longus mainly facilitates hip adduction rather than abduction. Thus, the specific function of the tensor fasciae latae in hip abduction and internal rotation makes it the correct answer in this context.