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Spine licence key6/10/2023 In spondylolisthesis, the fractured pars interarticularis separates, allowing the injured vertebra to shift or slip forward on the vertebra directly below it. Often, patients with spondylolysis will also have some degree of spondylolisthesis. Spondylolysis can occur in people of all ages without injury or sports participation. For this reason, it is the area most vulnerable to injury from the repetitive stress and overuse that characterize many sports. The pars interarticularis is the weakest portion of the vertebra. Fracture can occur on one side or both sides of the bone. Most commonly, this fracture occurs in the fifth vertebra of the lumbar spine, although it sometimes occurs in the fourth lumbar vertebra. The pars interarticularis is a small, thin portion of the vertebra that connects the upper and lower facet joints. ![]() In spondylolysis, a crack or stress fracture develops through the pars interarticularis (pars fracture).
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