1. Twenty-one patients on whom fusions have been done with bank bone and with fresh iliac bone have been studied to determine the efficacy of each procedure.
2. The pseudarthrosis rate, as calculated by vertebral interspaces covered, was almost three times as high with bank bone as with autogenous fresh bone.x
3. In the repair of pseudarthroses, the failure rate of bank bone was three times that of fresh autogenous bone.
4. The fact that bank-bone implantation gave no higher rate of pseudarthrosis we believe to be due to the accompanying meticulous Hibbs type of fusion.
5. Bilateral spine fusion as compared with hemifusion gave no statistical advantage.