Piriformis Syndrome – Sciatica
It can be a spine tingling sensation when we first experience a pain that shoots from the buttock down to the leg. An irritated sciatic nerve causes this sensation. We often hear about herniated discs in the lower back causing ‘sciatica’, the term given this pain.
What Causes Sciatica?
Several things can cause sciatica. This including dieases of the lumbar spine like herniated discs mentioned earlier, chronic hamstring tendinitis, fibrous adhesion of the sciatic nerve by the surrounding tissues. Other time, particularly in athletes is when the piriformis muscle irritates the sciatic nerve, causing pain in the buttocks and referring pain along the course of the sciatic nerve. This referred pain, called “sciatica”, often goes down the back of the thigh and/or into the lower back.
Symptoms Of Piriformis-Related Sciatica
Patients generally complain of pain deep in the buttocks. Sitting, climbing stairs, or performing squats makes the pain worse. The piriformis muscle assists in abducting and laterally rotating the thigh. In other words, while balancing on the left foot, move the right leg directly sideways away from the body and rotate the right leg so that the toes point towards the ceiling. This is the action of the right piriformis muscle.
Stretching The Piriformis
Stretching the muscle often duplicates the pain. To do the piriformis stretch, lie on your back, and flex the right hip and knee. Now, while grasping the right knee with your left hand, pull the knee towards your left shoulder. This adducts and flexes the hip. In this position, grasp just above the right ankle with the right hand, and rotate the ankle outwards. This applies internal rotation to the hip and completes the stretch. Another way to do this stretch is to stand on your left foot and place the right foot on a chair. The right knee and hip should be flexed at about 90 degrees. Now, using the right hand, press the right knee across towards the left side of the body while keeping the ball of the right foot on the same spot on the chair.
Another good piriformis/gluteal stretchis demontrated in this video
Anatomically, the piriformis muscle lies deep to the gluteal muscles. It originates from the sacral spine and attaches to the greater trochanter of the femur, which is the big, bony “bump” on the outside top of the thigh. The sciatic nerve usually passes underneath the piriformis muscle, but in approximately 15% of the population, it travels through the muscle. It is thought that acute or chronic injury causes swelling of the muscle and irritates the sciatic nerve, resulting in sciatica. Patients with an aberrant course of the nerve through the muscle are particularly predisposed to this condition.
The basis of symptoms and physical exam helps in diagnosing piriformis syndrome. There are no tests that accurately confirm the diagnosis, but X-rays, MRI, and nerve conduction tests may be necessary to exclude other diseases. Some of the other causes of sciatica include disease in the lumbar spine (e.g. disc herniation), chronic hamstring tendinitis, and fibrous adhesions of other muscles around the sciatic nerve.
Treatment is undertaken in a stepwise approach once properly diagnosed. Initially, progressive piriformis stretching is employed, starting with 5 seconds of sustained stretch and gradually working up to 60 seconds. This is repeated several times throughout the day. Any abnormal biomechanical problems, such as overpronation of the foot or other coexisting conditions, must be treated. Stretching can be combined with physical therapy modalities such as ultrasound. If these fail, then injections of a corticosteroid into the piriformis muscle may be tried. Surgical exploration is a last resort.
A good sports medicine physician with experience in caring for athletes with the piriformis syndrome can help direct appropriate management. There is no reason to dread for this syndrome with proper diagnosis and treatment. Good luck and good training.
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