Spinal dysraphism
Spina bifida refers to a malformation that occurs due to congenital incomplete closure of the spinal canal, with or without the protrusion of the meninges or nerve components. This malformation is very common clinically, accounting for 5% to 29% of the surveyed population. It is most common in the 1st and 2nd sacral vertebrae and the 5th lumbar vertebrae. The main cause of its occurrence is the developmental disorder of the cartilage center or the osteoblast center during the embryonic period, resulting in the failure of the bilateral vertebral arches to fuse at the back and form a gap of varying widths. Simple bony gaps are called occult spina bifida, which is the most common; if accompanied by meningocele or myelocele, it is manifest spina bifida, accounting for 1‰ to 2‰. The latter is quite difficult to treat and mostly belongs to the field of neurosurgery.