There are two types of bone graft commonly used autograft and allograft. Autograft is taken from the patient during surgery, this is usually from iliac crest or bone that is removed the spine. This is the best graft material but unfortunately can lead to new pain, deformity or complications. Allograft is bone taken from bone bank from deceased donor. This is almost as good as your own bone and saves you second surgical site. Recently bone substitutes made up of calcium have become available and may replace bone in the future. For more information please contact Executive Spine Surgery today. Good luck!