Herniated nucleus pulposus(HNP) occurs when a disk located between the vertebrae moves from position or ruptures. The disk is composed of a jelly type substance that serves to cushion the vertebrae; however, trauma or strain to the back can cause the disk to herniate. The lumbar region is the most common site for HNP. Patients could complain of severe low back pain along with pain, numbness or tingling in their legs and feet. Patients may also complain of muscle spasms or muscle weakness. The most common treatment for HNP is a combination of rest, anti-inflammatory medication followed by physical therapy. Steroid injections and surgery may be required depending on the severity of condition.
