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1)正常成人96例の頸椎レ線写を計測し,著者らの施設における成人の頸椎脊椎管前後径の正常範囲を求めた.結果はTable 1, 3に示す.撮影条件は,管球—フィルム問距離1.2m,拡大率は約120%である。
2)Symptomatic spondylosis 96例,radiological spondylosis 108例のレ線写上の頸椎脊椎管前後径を測定し比較した結果,symptomatic spondylosis例では正常成人例およびradiological spondylosis例に比べて有意の差をもって,脊椎管前後径がせまい結果を得た.
3)Cervical spondylosisの立場からみたnarrow spinal canalの範囲を相対値として16mm以下および絶対値として13mm以下と定めた.すなわち前記撮影条件で頸椎脊椎管前後径が16mm以下でspondylosisやdisc herniaによる神経症状の発症の可能性があり,13mm以下ではこれらにより神経症状はほぼ必発するものと考えられる.
1. The antero-posterior diameter (APD) of the cervical spinal canals in 96 healthy adults, 108 cases of radiological cervical spondylosis (asymptomatic) and 96 cases of cervical spondylosis with radiculopathy or radiculomyelopathy was measured for each vertebra by the method of Burrows. (Filmfocus distance was 1.2m).
2. The APD in patients with symptomatic spondylosis was found to be significantly narrower than those of without.
3. Since the upper limit of APD at C4 to C6 vertebrae in symptomatic spondylosis was 16mm, while the lower limit of APD in asymtomatic spondylosis was 14mm, the following conclusion appears justified.
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