The Experimental Research On The Effect Of Traction Angle And Traction Weight On Cervical Vertebral Stress

Objective： This subject was carried out to investigate the effect ofcervical vertebral stress with different cervical traction angles and tractionweight, c ombing with simul ation expe riments research guide by clinicalexperience, then offering the theoretical and experimenta l foundati on forthe establishment of the digital quazitation in order to build a mathematicalmodel for the change of cervical vertebral stress as the different tractionangle and traction weight.Method: The experiment was divided into two steps, first to design andmanufacture a traction machine which can display and adjust the tractionangle and weight. Then through meas uring100healthy adults about theirrelative pressure of the head weight and calculate the different Coefficientof variation of the head pressure、 body weight and BMI.4.5kg and5kghead models were selected and tested with different traction angle of l evel0degrees, proneness (5,10,15,20,25and30degrees), after stretch (5,10,15,20de grees),and different traction weight of0~10kg.The measure mentdatd was analyzed with the excel2003software.Result:1. Three coefficients of variation of one tenth of body weight, relative headpressure, body weight were:18%,10%,14%.The relative head pressure wasthe least one.The variation Coefficient of the hea d was the s mallest one.2. Two methods of traction in forward bends show that the cervical vertebrastress increased as the traction weight when the load exceeded a certaina mount, a nd the change follows the same trend.3. Two he ad with different weight were pulled in for ward bends and afterstretching. Results show that the cervical vertebra stress increased as the traction weight during anteflexion10degrees traction.but under the sametraction weight, the cervical vertebra bearing different,4.5kg modelcervical force greater than5kg during anteflexion10degrees,5kg modelcervical force greater than4.5kg during dorsiflexion10degrees.4. Measure the stress of cervi cal vertebra with different tra ction weight,thecervical vertebra stress decreased as their cervical traction angle fromdorsiflexion to anteflexion angle, and different heads followed the sa metrend.5. The cervical vertebra stress decreased as their cervical traction angle,butthe trend was different in anteflexion10degre es,0degr ees, Dorsiflexion10degrees show that when the horizontal Angle traction weight increase,The gap between cervical vertebra weight and traction weight followed thesa me trend.Conclusion:1. It was more accurate to select the traction weight according to the headweight than through body weight to estimate the weight of head.2. The stress in two different experiments(new traction machine experimentand methods of clinical traction experi ment) the cervical vertebra baredwas the same.3. The stress cervical vertebra bared were different when di fferent headsload the sa me traction weight.4. When bared the sa me traction weight, the stress cervical vertebra bareddiffers as the traction angle changes.