Different pressure in lumbar spine in sitting position with or without back rest

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  • MASUYAMA Shigeru
    富山市民病院整形外科〔〒939-8064 富山市赤田829-57〕
  • 澤口 毅
    富山市民病院整形外科〔〒939-8064 富山市赤田829-57〕
  • 西村 立也
    富山市民病院整形外科〔〒939-8064 富山市赤田829-57〕
  • 森永 敏生
    富山市民病院整形外科〔〒939-8064 富山市赤田829-57〕
  • 高澤 雅至
    富山市民病院整形外科〔〒939-8064 富山市赤田829-57〕
  • 内藤 充啓
    富山市民病院整形外科〔〒939-8064 富山市赤田829-57〕

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Other Title
  • 背もたれの有無で異なる半座位での腰椎負担―作用・反作用から見た椎間板負担―
  • セモタレ ノ ウム デ コトナル ハンザイ デ ノ ヨウツイ フタン サヨウ ハンサヨウ カラ ミタ ツイカンバン フタン

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Since the report by Nachemson (1976) concerning pressure on L3 from various positions, it is believed that sitting in a semi-upright position is contraindicatory after lumbar spine surgery. Nachemson's report indicated that there was twice the amount of pressure or more sitting in a semi-upright position than in an upright one. In this paper, a logical investigation on disc load with regards to action and reaction was performed. When W means body weight and α inclination of the body axis, disc pressure is equal to W (sinα+√3 cosα) in a semi-upright position without back rest. This trigonometric function draws a curve whose peak is 2W at 30 degree and W at 90 degree. These results support the report by Nachemson. On the other hand, disc pressure is equal to W sinα in a semi-upright position with back rest, because reaction is caused by the back rest. As a result, sitting in a semi-upright position with back rest after lumbar spine surgery is a reasonable posture to adopt.

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