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Activator Methods International Ltd.
2950 N. Seventh Street, Suite 200
Phoenix, AZ 85014
ofc 602-224-0220
fax 602-224-0230
toll free 1-800-598-0224
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Subject: The Activator® Adjusting Instrument / Bone Movement |
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| Title: Skin Accelerometer Displacement and Relative Bone Movement of Adjacent Vertebrae in Response to Chiropractic Percussion Thrusts. |
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| Reference: Smith DB, Fuhr AW, Davis BP. Skin accelerometer displacement and relative bone movement of adjacent vertebrae in response to chiropractic percussion thrusts. J Manipulative & Physiol Ther 1989; 12(2):26-37. |
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| Abstract: The authors studied relative bone movements in response to manipulative light taps to the spine. Piezoelectric accelerometers attached to bone of an anesthetized dog measured transverse, X-Z plane, movements of L2-L3 adjacent vertebrae while percussion thrusts of an instrument used for manipulation made inputs three vertebrae above and five vertebrae below the L2-L3 joint interface. Small, relative 1-mm translations and 0.5 rotations occurred during the first 19 msec. When one set of accelerometers were stabilized on the skin surface, half of the skin-bone translation maxima erred less than 2%. However, skin translations averaged 77% (SD=2%) of bone translations and skin rotations averaged 95% (SD=26%) of bone rotations. The results suggest the possibility that, with further development, piezoelectric accelerometers can be a noninvasive tool to study dynamic, relative, bone movement. (J Manipulative Physiol Ther 1989; 12:(2):26-37. |
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| Key Words: Manipulation, Chiropractic. |
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