The piriformis syndrome
is a neuromuscular disorder that occurs when
the piriformis muscles compresses or irritates the sciatic nerve. The symptoms
are similar to those generated by other conditions that evolve in sciatica,
such herniated disc; however, piriformis syndrome doesn’t refer to problems of
spinal nerve root and/or to the compression of an intervertebral disc.
Generally, the conditions of this type are indicated as entrapment neuropathies.
The exact causes of the piriformis syndrome
are unknown, but some hypothesis include:
Spasm of the piriformis muscle
or of an adjacent structure, in response to a traumatic event or excessive
Muscular anomalies with
Nerves anomalies (partial or
Fibrosis (due to trauma);
Pseudo aneurysms of the
inferior gluteus artery;
Intense physical activity.