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Because our experience with the conventional steel brace on children paralyzed by myelomingocele was generally unsatisfactory, we developed a polypropylene solid-ankle orthosis, using the principles of the SACH prosthesis and gait mechanics. This brace was applied to forty-seven children with paralysis at the third to fifth lumbar level, forty-three of whom showed considerable improvement in their gait. Reduced bracing was possible in eighteen patients. The over-all patient acceptance of the brace was due to improved appearance and comfort, increased stability, and improved gait. From our experience we feel that this is a major advancement in the bracing of children who are partially paralyzed at the third lumbar level or below.