A severe orthopedic impairment that adversely affects a child’s educational performance; includes impairments caused by congenital anomaly (e.g., clubfoot, absence of some member, etc) impairments caused by disease (e.g., poliomyelitis, bone tuberculosis, etc.) and impairments from other causes (e.g., cerebral palsy, amputations, and fractures or burns that cause contractures).