Spondylolysis is a spinal condition in which a stress fracture or other defect occurs in the part of the bone (pars interarticularis) that connects two vertebrae in the spine. These fractures usually occur in the lumbar spine, but occasionally happen in the cervical spine (neck). Children ages five to seven who perform gymnastics are particularly susceptible to this type of injury. Typical symptoms include an aching lower back, pain that increases when you move and stiffness in the hamstrings/thighs. Treatment for this condition usually calls for rest, anti-inflammatory medications, targeted stretching and exercises, while surgical interventions can include decompressive laminectomy and spinal fusion.