Because the lumbar spine does the most work among the other segments of the spine, it is the most prone to injury. Each lumbar spine segment is comprised of:
- Spinal bones (called vertebrae) such as L4-L5, stacked vertically with a disc between them. A normal disc acts like a sponge to absorb shock in the spine and has a lot of water. A tough outer ring called the annulus contains the gellike substance. It allows for flexibility and protects the spine from sudden movements.
- Facet joints which connect two adjacent vertebrae. These joints make our back flexible and enable us to bend and twist.
- Sciatic Nerve which begins in the lower back and runs through the back of
the thighs and into the calves and feet. The sciatic nerve conducts signals to the whole of the leg and feet.