Articles   |    
In vivo measurements of spinal column vibrations
MM Panjabi; GB Andersson; L Jorneus; E Hult; L Mattsson
J Bone Joint Surg Am, 1986 Jun 01;68(5):695-702
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Recent epidemiological studies have indicated high risk factors for persons exposed to vibrations. We measured the in vivo responses of the lumbar vertebrae and sacrum of five volunteers who were subjected to pure sinusoidal vertical vibrations in the seated position. Two acceleration amplitudes were used, one and three meters per second squared, with frequencies ranging from two to fifteen hertz. Spinal vibration was measured for two lumbar vertebrae using a transducer that was attached directly to the spinous processes. Axial, horizontal, and rotatory accelerations in the sagittal plane were determined for each vertebra. Vertical acceleration at the sacrum was also measured. The amplitude ratios of the accelerations at the vertebrae and sacrum with respect to the acceleration of the seat were calculated. Our results show that the pure vertical sinusoidal input vibration at the seat produced vibrations of the lumbar vertebrae not only vertically but also horizontally, as well as a rotational vibration. The resonance frequency of the lumbar vertebrae in the vertical direction was an average of 4.4 hertz. Horizontal and rotatory resonance frequencies could not be determined.

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    spine ; vibration
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    These activities have been planned and implemented in accordance with the Essential Areas and policies of the Accreditation Council for Continuing Medical Education (ACCME) through the joint sponsorship of the American Academy of Orthopaedic Surgeons and The Journal of Bone and Joint Surgery, Inc. The American Academy of Orthopaedic Surgeons is accredited by the ACCME to provide continuing medical education for physicians.
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