title: [Measurement technique for the cracking sounds during spinal manipulation].
abstract: OBJECTIVE
  To design a set of equipment to collect, locate and analyze the cracking sounds during spinal manipulation.
  
  
  METHODS
  On the basis of reviewing the current techniques for cracking sound measurement, we designed a cracking measurement system consisting of a pulse generator, transmission/reception interface, calibrating wave generator, compound sensors, computer, analytical software, and output components.
  
  
  RESULTS
  Preliminary experiments demonstrated that the cracking sounds could be detected at a distance of 40 cm, suggesting that this system was technically feasible with some improvements to be made.
  
  
  CONCLUSIONS
  This device can be used for collecting, locating and analyzing the cracking sounds during spinal manipulation.
authors.affiliation: Department of Traditional Chinese Orthopedics and Traumatology, Southern Medical University, Guangzhou 510515, China.
authors.forename: Yi-Kai
authors.initials: YK
authors.lastname: Li
authors.forename: Jian-Hua
authors.initials: JH
authors.lastname: Chen
authors.forename: Gui-Chun
authors.initials: GC
authors.lastname: Qiu
mesh_terms: D004867:Equipment Design; D006801:Humans; D020393:Manipulation, Spinal / Q000295:instrumentation*; D013016:Sound; D013018:Sound Spectrography / Q000295:instrumentation* / Q000379:methods