[Simple bone cyst--pathophysiology and treatment]

Internal pressure of simple bone cyst was slightly higher than normal bone marrow pressure measured on contralateral side. Internal pressure of the cyst measured during drill-holing with Kirschner wire gradually decreased along with the increase in the number of drill-holes. Internal PO2 was markedly lower than PO2 of venous and arterial blood measured synchronously. Venous obstruction in bone may be an etiology of simple bone cyst. Follow up study showed that all cysts of six cases treated by the multiple drill-hole method were filled up with bony tissue within five months after the treatment, and the clinical result of the treatment was excellent. Multiple drill-hole method may be the first choice in the treatment of simple bone cyst in the younger patients, because the operative invasion of this method was minimum.