In addition,
the piriformis muscle dysfunction may overlap with a variety of other problems, such as gluteus medius dysfunction, herniated or bulging disks, pelvic stress fractures, tight adductor muscle group, limb length difference, tight medial hamstrings and the aforementioned ineffective gluteus maximus.
Many large and small
muscles have relationships with the ligaments of the sacroiliac joint including the
piriformis (see «
piriformis syndrome», a condition often related with sacroiliac joint
dysfunction), biceps femoris, gluteus maximus and minimus, erector spinae, latissimus dorsi, thoracolumbar fascia, and iliacus.