[en] Objective: To investigate the clinical characteristics and treatment of radiation osteomyelitis of jaws (ROJ). Methods: The clinical records of 65 ROJ cases treated during the period from 1991 through 2003 were examined. Results: The average dose of radiotherapy was 70.2 Gy. ROJ were more common in the mandible (72%) and in the first four years after radiotherapy (86%). Conservative treatment relieved the symptoms and controlled the progress of the diseases. The cure rate of ROJ was 92% by extensive resection of sequestrum. The survival rate of transplant flap was 95% with immediate vascularized tissue graft. Conclusion: 70 Gy can be regarded as reference threshold for clinical irradiation. Extensive resection of sequestrum in combination with immediate vascularized tissue grafts clearly improved the prognosis of radiation osteomyelitis of jaws. (authors)