THE RELATIONSHIP BETWEEN ACUTE STRAINS OF THE
HIP FLEXORS AND THE ABDOMINAL FASICA
By the way, the very tip (front) of the Illica Crest is called the Anterior Superior Illiac Spine (ASIS). Feel your own to feel how thick / dense this bony area is. This is where people get an injury called a "Hip Pointer".
LEFT ILLIAC CREST
ABOVE: look how the Internal Oblique Muscle attaches to the Illium, clear down to the tip of the Illiac Crest called the ASIS. What is interesting is that at least three of the various layers of abdominal muscles (rectus abdominis, external oblique, internal oblique, transverse abdominis) have attachments to the Illiac Crest.
RIGHT: You can see that the Tensor Fascia Latae with its mega-long tendon (the ITB), as well as part of the Quadriceps Muscle, and the Sartorius Muscle, all attach to the Illicac Crest. These are some of the muscles that are collectively known as the "Hip Flexors".
RIGHT ILLIAC CREST