頚椎後縦靱帯骨化症（非骨傷性頚髄損傷合併例を含む）の骨化タイプ別椎間可動域および脊髄面積

Range of Motion and Spinal Cord Cross-sectional Areas According to Ossification Type of Cervical Ossification of the Posterior Longitudinal Ligament

　背景：Reconstruction-CTの登場で靱帯骨化の形態がより詳細にわかるようになった．

　方法と対象：頚椎後縦靱帯骨化症(以下C-OPLL)患者の骨化タイプをreconstruction-CTを用いて3タイプ(連結部，被覆部，非連結部)に分類し，タイプ別に椎間可動域と脊髄面積とを計測した．非骨傷性頚髄損傷を来したC-OPLL患者では脊損発生部の検討をした．

　結果：骨化が椎間板後方で連続していても椎間可動性は残余しており，脊髄面積にも変化を生じていた．骨化の途絶部での脊髄損傷発生率は64%であった．

　Background：Reconstruction-CT has provided better understanding of ossification of the spinal ligaments.

　Methods：Three types of ossification, i.e., connection department ossification, coating part ossification, and non-connection department ossification, were identified in patients with cervical ossification of the posterior longitudinal ligament (C-OPLL) by reconstruction-CT.　Ranges of motion (ROMs) and spinal cord cross-sectional areas (SCCSAs) were calculated.　An CT myclography was done during neck flexion and extension, and ROMs and SCCSAs were measured at each disc level between C2/3 and C7/T1.　The sites of spinal cord injury in patients with spinal cord injury who had no abnormal radiological findings was examined.

　Outcome：The ROMs of patients with the connection department ossification type of C-OPLL were reduced, but the SCCSAs had changed.　The incidence of spinal cord injury in patients with adjacent part of connection department and coating part ossification was 64%.