Abstract
1. The usual methods of posterior arthrodesis of the lumbo-sacral joint are not satisfactory in cases in which laminectomy has been performed.
2. Estimation of fusion by mobility radiographs is unreliable and cannot distinguish between fibrous ankylosis and bony fusion.
3. Bone grafts inserted from behind between the vertebral bodies almost invariably fail to become incorporated.
4. Intertransverse arthrodesis has given promising results and is probably the best method available at present.
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