A Spondylolysis and a Spondylolisthesis of the lumbar spine are two distinctive diagnoses in a patient. Discuss the following this week: What are the main differences in a spondylolysis and a spondylolisthesis of the L5 vertebrae? You are performing a pre-participation evaluation on a college freshman who is a volleyball player. You note that his paperwork indicates a Grade II Spondylolisthesis at the L5 level. What criteria would you consider to determine if they could successfully participate in athletics? Would you require any additional follow up? Explain your reasoning.