Common low back problems include disc prolapse, spinal stenosis and low back pain . Disc herniation can be categorized as protrusion (disc contained by the annulus fibrosus), extrusion (disc materials migrated out through the annulus fibrosus, but contained by the posterior longitudinal ligament) and sequestration (disc materials released into the spinal canal) . Disc prolapse commonly presents with pain and numbness radiating to the buttocks and legs due to spinal nerve or nerve root compromise; however, it may be asymptomatic in approximately 24% of all cases . Symptomatic lumbar disc disease (SLDD) is a term used to differentiate between structural abnormalities without clinical symptoms and abnormalities that induce clinical presentations . Approximately 95% of all instances of lumbar disc herniation (LDH) occur at L4-L5 and L5-S1 levels .