1. A method of traction correction of severe deformity of the cervical spine resulting from ankylosing spondylitis has been presented.
2. It is suggested that the halo described by Perry and Nickel may have a wide application in problems requiring carefully controlled adjustment of position and immobilization of the cervical spine and skull.
3. A case has been reported in which the halo was used for correction and immobilization in conjunction with occipitothoracic spine fusion under local anesthesia.
4. The halo-fusion technique is believed to be safer than the less precise immobilization techniques; the minimum discomfort experienced by the patient in this device is remarkable and is apparently the result of the rigid immobilization of the skull and cervical spine.