I had one of the first disc replacements in our hospital. At first I didn't think the operation worked because I still had back and leg pain. But two days later it was gone. What could be the cause of the delay?

When the disc is replaced with an artificial device the disc space suddenly increases to a more normal size. This can put traction or increased tension on the nearby spinal nerve. The result is back pain or even back pain that goes down the leg called sciatica.

Once the body gets used to the new spacing and position, the symptoms may go away. Damage to the nerve or ongoing swelling from inflammation in the area may cause persistent pain.