Lumbar traction

I'm using mechanical traction for quite a few different lumbar conditions. I tend to use forces between 12 and 18 kilogram. Just started work in a different practice where one of the guys is using a minimum of 30 kg as he read in some research that that would be the minimum force required to distract the vertebras'
Can anyone point to further research or do you have any ideas opinions on this subject? I'd like to hear them

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[mysingy]

Lumbar Traction or Lumbar flexion. When hospital ward 'traction' changed systems from bilateral leg to pelvic 'traction' nursing staff had to raise the tension line of the pelvic system,to above the toes of the patient, the significance of this was not recognised until the publication of Loads in the Lumbar Spine during Traction Therapy 2001 Lee etal. quite simply the bigger the foot the higher the tension line angle, no longer pure traction but sustained lumbar flexion. Clinical trial of a sustained lumbar flexion system which allowed for variable posture as a means of instinctive manipulation was undertaken in the UK. The trial was a resounding success and a domestic application of the system is about to be established in the UK.
If one takes 7.5% as the co-efficient of friction of the patient bodyweight, applied at 20 degrees x sine produces 2.5% of bodyweight to the lumbar spine this is a .5% of the natural intrinsic load produced by raising the legs at 90% to the spine and resting the lower leg (see loads in lumbar spine etc) Regards Mysingy