Orthopedic emergencies, orthopedic operations, orthopedic infections, acute and chronic osteomyelitis, septic arthritis, bone tuberculosis, degenerative joint diseases, orthopedic tumors, vertebral column diseases, pediatric orthopedics, congenital diseases of the hip, foot deformities, aseptic bone necrosis, congenital lesions of the nervous system, hydrocephalus, cerebrovascular disease, central nervous system infection.