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Macquarie Engineering and Technical Services

Positioning Frame for Pelvis - Chiropractic

METS was tasked to manufacture a pelvic positioning frame so that a model of the pelvis could be positioned at various angles around three axies of rotation for radiographic projection. The projected image was analysed to determine the accuracy of measuring sacral obliquity and the degree of error in measuring dihedral angles on plan films. The pelvis with a known sacral obliquity angle (0, 5, 10, 15, 20 degrees) was radiographed with specific amounts of tilt and rotation.

The images demonstrate just how this was achieved by utilising a multi axis jig with a three tier alignment matrix including a unique gimbals system from the designer John Dulhunty. Looking at the images you can see just how complex it was to transform the ideas into reality and added value was introduced into the design with vernier scales and angular measurements for alignment and analysis of dihedral angles only possible with this type of arrangement.

 

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