Hi, my name is Dr. John Shim, and I would like to discuss a very common problem encountered by almost all of us. That is sciatica. While many of you will know it as a radiating leg pain from the back, into the buttock, and down the back of your thigh into your foot, we are concerned about what caused that pain. As an orthopedic surgeon, sciatica is defined by irritation of the sciatic nerve. The sciatic nerve is composed of the nerves of the L4 ,L5, S1, S2 and S3 nerve roots. These are located to the lower spine. The nerve roots exit the spine, and form together, and travel into the buttock, down the back of the thigh and then split into the Tibial and Peroneal nerves at the level of the knee. Individual components of the nerve provide feeling, strength, and reflexes to specific body areas. For example, the S1 nerve provides signaling to your gastrocnemius muscle, the muscle that lets you stand on your tiptoes, sensation to the back of the calf and outer foot, and the ankle reflex. While sciatica is usually associated with nerve irritation, on occasion, you can also originate at the buttocks, where the nerve can be irritated by pressure on the muscle. In general, the most common cause of sciatica is nerve root irritation by a disc herniation or bone spur on the individual nerve roots. Most episodes of sciatica resolve on their own, with time. On occasion, the sciatica may become progressive, and with more pain, weakness and numbness. In those instances, people should seek the advice of a spinal specialist. As a spinal specialist, I may recommend testing for sciatic symptoms, that may include an MRI of the spine. MRIs are helpful in identifying disc herniations, or bone spurs that are causing the corresponding sciatica complaints. This is Dr. John Shim, and I hope you found this video helpful for your understanding of sciatica. Thank You

Sciatica is one of the most common medical problems that take people to the doctor. Though you hear the word frequently, most people don’t understand what causes it and why we blame your back for that terrible pain in your leg.

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In your low back (lumbar spine) the nerves start separating within the spinal cord and go the bowel, the bladder and the legs. When there is an interruption or pressure on these nerves, it can send pain, numbness or tingling to anywhere in the lower part of the body. There is often no back pain with this, just shock like pain in the buttock or the legs (usually one side or the other).

Sciatic pain is caused by pressure on one or more of the nerves leaving the spinal canal. It can be a herniated disc. This is usually one sided and a sudden onset. Anything can cause it from a sneeze to moving something heavy. The pain is often sharp and shock like. There is usually numbness and tingling that follows the same route as the pain. We can almost always pinpoint where the herniation is by following the “pain path”.

Another cause of sciatica is lumbar stenosis. This is a slower onset and is frequently in both legs. It happens as the nerve openings in the spine (foramina) gradually narrow over time. It can be made worse with constant “wear and tear” on the spine, previous injury, or a family propensity towards to spinal stenosis. The pain is generally a dull ache in the legs that gets worse with standing and walking, and is relieved by bending forward or sitting down. If your back feels much better when you lean over a shopping cart, there is a good chance you have spinal stenosis. It is often mistaken with vascular disease so proper testing is needed for a definitive diagnosis.

Spondylosthesis is another cause of Sciatica. This is often referred to as a “slipped disc” but is actually an abnormal movement of vertebrae on vertebrae in the spine. As the bones move out of normal line, either forward or backward, they catch the nerve and send pain down the leg or legs. This pain is generally lessened by changes in position.

There are many treatments for Sciatica but they all have the same goal, to remove pressure off the nerves in the back. Non-surgical treatments should always be tried first unless certain symptoms are present. If paralysis, bowel or bladder incontinence, sexual dysfunction or drop foot are present, an immediate visit to the ER is recommended. These are all symptoms of a serious nerve compression and should be dealt with very quickly before these symptoms become permanent.

Non-surgical treatments include physical therapy, chiropractic care, and steroid injections. Though every treatment has possible adverse effects, these are all proven to work in a large number of people. Preventing sciatica can be encouraged by strengthening your core, keeping your weight down and not smoking.


  • Altun I, Yüksel KZ. Lumbar herniated disc: spontaneous regression. Korean J Pain. 2017 Jan;30(1):44-50. PubMed PMID: 28119770

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