Sagittal static imbalance in myelomeningocele patients: improvement in sitting ability by partial and total gibbus resection

The progression of kyphosis in myelomeningocele is independent of skeletal growth and requires early operative correction and stabilization to prevent a loss of sitting ability. In severe cases, only vertebrectomy makes it po ssible to achieve correction, stability and skin-closure without tension. I n 14 patients with myelomeningocele gibbus, kyphectomy was performed, remov ing two vertebral bodies on average. The average kyphosis angle decreased f rom 128 degrees to 81 degrees, enabling most of the patients to participate again in social life by restoring wheelchair mobility. Nevertheless, a sig nificantly higher complication rate was found compared to other correctiona l operations, lengthening the average hospital stay to 41 days. Special pro blems arose from trophic disorders of the skin and soft tissue and from the dystrophic muscles below the level of neural malfunction. In three cases, kyphosis reappeared cranial to the fused segments, requiring ventral stabil ization. With respect to increasing kyphosis angle, an early intervention s hould be aimed at. A secondary operation can be necessary, if surgery is pe rformed without taking care of the growth potential.