Final answer:
The right tensor fascia latae (TFL) often becomes overactive and stiff due to the weakness of the gluteus maximus muscle, which should normally extend and abduct the femur.
Step-by-step explanation:
The right tensor fascia latae (TFL) may become overactive and stiff due to the weakness of the gluteus maximus muscle. The gluteus maximus is a large and strong muscle that extends and abducts the femur. When the gluteus maximus is weak, the TFL can become overactive to compensate for the lack of strength and stability provided by the gluteus maximus, leading to stiffness and overactivity in the TFL. This compensation often occurs because the TFL is part of the iliotibial tract, alongside the gluteus maximus, and helps stabilize the knee, potentially placing additional strain on the TFL when the gluteus maximus isn't functioning adequately.