1. Bony union is more difficult to obtain in congenital pseudarthrosis than in any other type of non-union.
2. Union is more difficult to secure in younger than in older children.
3. If union can be obtained in childhood, the ultimate deformity and shortening of the leg are lessened or may be avoided.
4. The dual bone graft affords a sound mechanical procedure which should increase the percentage of bony unions in this condition.
5. The technique of the dual graft may also be used in the treatment of bony defects and in non-unions difficult to treat, resulting from causes other than congenital pseudarthrosis.