Ossification of the anterior longitudinal ligament of the spine was first reported by Dr. Forestier and Dr.Rotes in 1950. However, in no other countries but Japan there have been reports on the ossification of the posterior longitudinal ligament of the spine which was first reported by Tsukimoto in 1960. About 45% of ossification of the posterior longitudinal ligament of the spine have a combination of ossification of the anterior longitudinal ligament and yet it is considered to be a variety of the spinal geriatric conditions, favorable to the cervical spine. The condition develops similar symptoms of cervical spondylosis. Authors report two cases of ossification of posterior longitudinal ligament of cervical spine of Korean nationals at St. Marys hospital, Catholic Medical College.