Which muscle acts as a synergist to medial rotation of the hip?

The tensor fascia latae is indeed the correct answer as it plays a significant role in assisting with medial rotation of the hip joint. This small muscle is located on the lateral side of the hip and is part of the iliotibial band, a structure that helps stabilize the hip and knee during movement. When the tensor fascia latae contracts, it contributes to the medial rotation of the thigh, particularly when the hip is flexed, making it an important synergist for movements that require this action.

Understanding the role of the tensor fascia latae in hip movement is crucial for recognizing its importance in activities involving stabilization and control during walking, running, and other sports.