If there is a limitation of internal rotation of the femur, sometimes the problem can be with the tightness of the sartorius muscle.
The area around the ASIS is an attachment site for four muscles:
Sartorius attaches at the ASIS
Rectus Femoris attaches just deep to the Sartorius at the AIIS
Tensor Fascia Lata attaches just posterior to the Sartorius along the iliac crest
Iliacus attaches along the inside of the iliac crest
In this video, I show soft tissue release techniques that can be used for the Sartorius and Tensor Fascia Lata.
Sartorius – Soft Tissue Release