Hip Articulations
www.exrx.net/Muscles/Iliopsoas.html

"These core muscles are namely the psoas and iliacus muscles (these are often grouped together and referred to as the iliopsoas) that attach to the anterior spine and the inner side of the pelvic basin. (The psoas inserts on the femur thus connecting the truck of the body to the legs.) When contracting in tandem with other supporting muscles the iliopsoas creates movements in the pelvic region." -Ayshe

www.thehipcircle.com/article/display.asp