Etymology: Louis X.E.L. Ollier, French surgeon, 1830-1900; Gk, dys, bad, chondros, cartilage, plasis, formation
a rare disorder of bone development in which the epiphyseal tissue responsible for growth spreads through the bones, causing abnormal irregular growth and deformity. The long bones and the ilia are most often affected. Orthopedic procedures to correct deformities may be necessary and helpful, but invalidism is the usual prognosis. See also hereditary multiple exostoses.