Ischiofemoral impingement is a syndrome defined by hip pain associated with narrowing of the space between ischial tuberosity and lesser trochanter.
This is caused by abnormal contact between the lesser trochanter of the femur and the ischium, and presents as atypical groin and/or posterior buttock pain. Often on imaging of this syndrome, the quadratus femoris, one of the deep hip muscles, will show increased signal on MRI.
The symptoms are gradual in onset and may be similar to those of hamstring injury or bursitis. The presence of ischiofemoral impingement may be indicated by pain caused by a combination of hip extension, adduction and external rotation. The pain is usually posterior.
In some cases the quadratus femoris muscle can be injected with cortisone. This Is a relatively newly identified diagnosis and as such there is not much literature out there on procedural options.