Slipped
You may have heard the term “slipped disc” used to describe a low back injury. Discs do not actually “slip.” Rather, they may herniate or bulge out from between the bones. A herniation is a displaced fragment of the center part or nucleus of the disc that is pushed through a tear in the outer layer or annulus of the disc. Pain results when irritating substances are released from this tear and also if the fragment touches or compresses a nearby nerve. Disc herniation has some similarities to degenerative disc disease and discs that herniate are often in an early stage of degeneration. Herniated discs are common in the low back or lumbar spine.
Sciatica
Pain that radiates from your lower (lumbar) spine to your buttock and down the back of your leg is the hallmark of sciatica. Occasionally, sciatic pain in men is caused by sitting on a wallet.
The sciatic nerve is the longest nerve in your body. It runs from your pelvis, through your hip area and buttocks and down each leg. The sciatic nerve branches into smaller nerves as it travels down the legs providing feeling to your thighs, legs, and feet as well as controlling many of the muscles in your lower legs. The term sciatica refers to pain that radiates along the path of this nerve.
