OsteoAdapt SP Spinal Fusion (OASIS)

People can join this study if they are 18 to 80 years old and fully grown. They must be planning to have a planned spine surgery for lower back problems, such as pain caused by worn out discs. They must have had this pain for a while and tried treatments like physical therapy or medicine for at least six months without enough relief. People must be healthy enough for surgery, have a certain level of back or leg pain, and be able to come to follow up visits. People cannot join if they have had certain past spine surgeries in the same area, have weak bones such as severe osteoporosis, have infections, or use tobacco or certain medicines like steroids close to the time of surgery. They also cannot join if they have serious health problems, certain autoimmune diseases, active infections like HIV or hepatitis, or cancer within the past five years.