Safety and Preliminary Efficacy Study of Mesenchymal Precursor Cells (MPCs) in Subjects With Lumbar Back Pain

The purpose of this study is to compare two doses of immunoselected, culture-expanded, nucleated, allogeneic adult MPCs when combined with hyaluronic acid to two control intradiscal injections in subjects with chronic low back pain due to moderate Degenerative Disc Disease (DDD) at one lumbar level from L1 to S1. All investigational subjects in this study will undergo injection of either 6 million (M) or 18M cells in a hyaluronic acid carrier into the degenerated lumbar disc's nucleus pulposus. All control subjects will undergo an intradiscal control injection with either saline or hyaluronic acid only

This is a prospective, multicenter, double blinded, controlled clinical study comparing two doses of immunoselected, culture-expanded, nucleated, allogeneic adult MPCs when combined with hyaluronic acid to two control intradiscal injections in subjects with chronic low back pain (\> 6 months) due to moderate DDD at one lumbar level from L1 to S1 and unresponsive to conservative therapy for at least 3 months (including physical therapy). After the screening and injection visits, each subject will be evaluated clinically and radiographically at 30 days, and again at 3, 6, 12, 24 and 36 months after injection. Subjects will be evaluated at the same time points for safety.