What is the relationship to the highest level of injury and bladder (detrusor) muscle activity.

In a study by Seo-Young Kim, MD, et al, they found 1/3rd of the studied subjects with overactive bladders had their highest level of spinal cord injury at or above the 2nd lumbar spine level. Two-thirds of the studied subjects thus had underactive bladders and had their highest level of spinal cord injury at or below the 3rd lumbar spine level.