Lumbar Discectomy Control Study, Risk Factors for Reherniation

This study will enroll up to 100 patients at select US (approximately 4-7) sites. Patients that are scheduled for an L1-S1 discectomy and who meet the pre-operative eligibility criteria will be considered for study participation. Patients will be divided into two arms (small- and large-defect) based on the size of their annular defect as measured intra-operatively; each arm will be capped at 50 patients. All patients included in the trial will be followed for at least 12 months.