椎間板髄核内圧の低周波負荷応答の測定

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Epidemiological studies have suggested that because of their frequent exposure to mechanical vibration, bus and truck drivers are especially susceptible to disc disorders. It has been reported that drivers of such vehicles are subjected to low-frequency vibration up to 6 Hz. The intervertebral disc regulates the viscoelastic properties of spinal segments. It is thought that the intradiscal pressure plays an important role in the mechanical response of a spinal segment to vibrations. While previous studies have made direct in vivo measurements of intradiscal pressure under static conditions, no data has been reported on intradiscal pressure response to vibration loading under either in vivo or ex vivo conditions. The present study was undertaken to measure the intradiscal pressure response to cyclic loading in a physiological saline solution simulating in vivo conditions. The effects of mean load, amplitude and frequency of cyclic loading on the intradiscal pressure response were investigated using calf lumbar spinal segments. The experiment employed mean loads of 20,60,and 100 N with amplitudes of 10,15,and 20 N and compared the low-frequency effects of 0.05,0.5 and 5 Hz. The mean load was applied for 1 hour prior to the cyclic loading test in order to take the equilibrium intradiscal pressure into account. The relationships between load versus displacement. and load versus intradiscal pressure were found to be affected by the mean load and the frequency of cyclic loading.
1998-09-25

椎間板髄核内圧の低周波負荷応答の測定

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