1. The etiology and natural progress of lumbar kyphosis in children from three to twelve years of age with myelomeningocele are reviewed.

2. The indications for operation have included intractable or recurrent skin ulceration, inability to wear calipers for walking, inability to sit in a wheel-chair and inability to perform ileal conduit operations.

3. The technique of osteotomy-excision of lumbar vertebrae used in eighteen cases is described.

4. The results in fourteen children are described. The primary aims of operation have been achieved in all patients.

5. A comparison is made with the results of neonatal osteotomy-excision of the spine in the newborn. Recurrence of deformity, but at a much reduced rate, must be anticipated after either operation.