This paper discusses the theory that subtle lumbosacral canal impingement of the L5 nerve root may be a relatively common occurrence in older footballers ... Many clinicians subscribe to the concept ...

These sensory and motor nerve roots unite to create the 31 spinal nerves, each named for the individual vertebra from which it exits. The spinal nerves further divide into anterior and posterior rami.

Herniated discs and spinal stenosis are the most common causes of a pinched nerve in the lower back. Other conditions like fractures, tumors, and infections can bring about symptoms as well.