The gross motor function classification system for cerebral palsy and single-event multilevel surgery: is there a relationship between level of function and intervention over time?

Background: The purpose of this study was to determine what effect, if any, an intervention such as Single-event multilevel orthopaedic surgery (SEMLS) might have on the relative stability of the gross motor function classification system (GMFCS) for cerebral palsy over a 5-year time period.

Methods: Eighty-four children with spastic cerebral palsy who underwent SEMLS were included. The patients had an average of 5.