HETEROTOPIC OSSIFICATION AFTER RHIZOTOMY AND FEMORAL OSTEOTOMY

In 15 patients with cerebral palsy who underwent selective posterior r hizotomy (SPR) and subsequent proximal femoral varus derotation osteot omy (VDO), heterotopic ossification (HO) around the hip after VDO was noted in four of eight patients with spastic quadriplegia (seven of 26 hips, 27%). HO was not noted in the seven patients with spastic diple gia. A radiographic review of 118 hips with a femoral VDO in the 69 pa tients with cerebral palsy who did not undergo SPR during the same per iod showed no HO. Frequent evaluation of post-rhizotomy patients with cerebral palsy quadriplegia after a femoral VDO is necessary to recogn ize HO as a possible etiology for late-onset pain and limited hip rang e of motion (ROM).