Could you explain what is pars defect at l5 mean anyway?

Termed spondylolysis: A condition called a pars fracture or spondylolysis this is typically a congenital defect that will manifest itself in childhood but may not become symptomatic at all or at some point later in life ; can be a real fracture. These typically can be managed non op 90% of the time. The most common vertebra to find it is at l5. Found in 6-8% of the us population. They can cause back ;/or leg symptoms.