24 cases of patients over 60 years of age treated by anterior cervidal body fusion (AVBF) were clinically studied and compared with 50 casses of patients under 60 yeares of age treated by AVBF. The follow-up time was more than 1 year (15 to 71 months) and the mean age was 65.8 years.
In elderly patients and young patients, the mean preoperative JOA scores were 12.6 points and 12.3 points, the post operative JOA scores were 14.7 points and 15.5 points, and the recovery rates evaluated by Hirabayasi's method were 60% and 66.2%, respectively.
In the elderly patients, preoperative X-rays of the lower cervical spine showed decrease of the range of motion (ROM) due to severe degenerative spondylotic changes, and relatively percent ROM increase of the upper cervival spine major involved level was seen.
These findings suggest that instability of the upper cervical spine may pose as a risk factor particularly for cervical spondylotic myelopathy in elderly patients.