what is spondylolysis lumbar region
Spondylolysis is a break (fracture) in the arch of the rear (posterior) segment of the vertebra, called the pars interarticularis. In 95 percent of individuals, spondylolysis affects the fifth lumbar vertebra (L5) (Weinberg). Incidence and Prevalence: In the US, the incidence of spondylolysis is 3% to 7%.