The<unk>  muscle acts as an external rotator, weak abductor, and weak flexor of the hip
It originates from the anterior sacrum and inserts on the greater trochanter of the femur
The sciatic nerve typically exits the greater sciatic foramen deep along the inferior surface of the<unk>  muscle, but in approximately 20% of people, the sciatic nerve pierces the<unk>  muscle 
Local inflammation of the<unk>  can cause muscular compression or irritation of the sciatic nerve causing local or radicular pain
Piriformis syndrome
Acute Trauma
Pronator teres syndrome
Femur fracture
Carpal tunnel syndrome
Proximal
Cauda equina syndrome
Intracapsular