 The patient is a man with a history of longstanding back, buttock, and bilateral leg pain.  He was evaluated and found to have bilateral pars defects at L5-S1 with spondylolysis and instability.  He was admitted and underwent an uncomplicated surgical procedure as noted above.  In the postoperative period, he was up and ambulatory.  He was taking p.o. fluids and diet well.  He was afebrile.  His wounds were healing well.  Subsequently, the patient was discharged home.