Journal of Research in Medical Sciences1735-199514120090223Slipped vertebral epiphysis (report of 2 cases)6366ENMajid RezaFarrokhiNeuroscience research center,chamran hospital,neurosurgerydepartment, Shiraz university of medical sciences.. farokhim@sums.ac.irMohamad sadeghMasoudi200811052009011120081216Avulsion or fracture of posterior ring apophysis of lumbar vertebra is an uncommon cause of radicular low back pain in pediatric age group, adolescents and athletes. This lesion is one of differential diagnosis of disc herniation. We reported two teenage boys with sever low back pain and sciatica during soccer play that ultimately treated with diagnosis of lipped vertebral apophysis. KEY WORDS: Ring Apophysis, vertebral fracture, sciatica, low back pain, disc herniation.