頸椎後縦靱帯骨化症と脊椎管前後径について

The Antero-posterior Diameter of the Cervical Spinal Canal in the Ossification of the Posterior Longitudinal Ligament

　1）38例のsymptomatic OPLLと29例のasymptomatic OPLLのAPD（Fig．1-A）を測定し正常成人例と比較した．

　2）symptomatic OPLLとasymptomatic OPLLのTPDと靱帯骨化の厚さ（Fig．1-B,C）を比較検討した．

　3）靱帯骨化の年間成長率を計算した．

　4）OPLLの発生頻度を報告した．

　5）OPLLとcervical spondylosisとの比較を行った．

1. The antero-posterior diameter (API) Fig. 1 A) of the the cervical spinal canals in 38 cases of symptomatic ossification of the posterior longitudinal ligament (OPLL) and 29 cases of asymptomatic OPLL was measured for each vertebra, and the thecoperiosteal diameter (TPD-Fig. 1 B) of the cervical spinal canals in the same cases was measured.

2. The APD in the cases of symptomatic OPLL was found to be significantly smaller than those of asymptomatic OPLL.

3. The TPD in symptomatic OPLL was also found to be more significantly smaller than those of asymptomatic OPLL.