Surgical methods of repairing defects and deficiencies in the spine are disclosed. The methods involve delivering a single part in-situ polymerizing fluid to (i) close a weakened segment or fissure in the annulus fibrosus, (ii) strengthen the annulus, (iii) replace or augment the disc nucleus, or (iv) localize a disc prosthesis. The methods may include placing a delivery conduit adjacent to the repair site and providing a liquid tissue adhesive to bond to and repair a disc defect or deficiency