Bone Morphogenetic Protein-2 and Bone Marrow Aspirate With Allograft as Alternatives to Autograft in Instrumented Revision Posterolateral Lumbar Spinal Fusion

rhBMP-2 may be an appropriate alternative to autogenous bone graft in both single- and multilevel revision PLF, whereas BMAA may be appropriate as a substitute in single-level revision PLF. The use of BMAA in single-level revisions may be a more cost-effective option than rhBMP-2.