A pars illness is a fracture between two joints inside the part of the vertebrae that has bony extensions that form the adjoining joint known as the pars interarticularis. It’s every now and then referred to as spondylolysis, the term for a spinal fracture or disorder that occurs within the a part of the vertebra wherein the pars interarticularis is placed. If the spoil is intense enough, it could cause the top part of a vertebra to interrupt away from the lower element. From time to time a spinal disc will slip in the front of an adjoining one (spondylolisthesis) and press on nearby nerves.