Due to its heavy load-bearing function and wide range of flexibility, the L4-L5 motion segment is susceptible to developing pain from degeneration and injury. | Spine-health

Due to its heavy load-bearing function and wide range of flexibility, the L4-L5 motion segment may be more susceptible to developing pain from injury and/or degenerative changes compared to other lumbar segments. Spinal conditions including disc herniation or facet joint osteoarthritis may irritate the L4 nerve and cause radicular pain, tingling, numbness, and weakness along the path of the nerve. | Spine-health