L3 and L4 responds to lumbar vertebrae. in between that two vertebra there will be cushion like disc to promote movement and stability of vertebra.
due to repeated work in awkward or unaccostomed body position, or trauma the disc will bulge out from its position.
it is more common in posterolaterally where the capsule ie., covering the disc is weak.
so bulges out and compresses the spinal nerves emerging between the vertebra.
results in numbness weakness of leg thigh muscles and pain due to inflammation around nerve coverings
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