A Correlation to Spinal Biomechanics

D. Robert Kuhn, D.C., D.A.C.B.R., Michael Tremba, D.C., Logan College of Chiropractic, and Dennis Nosco, Ph.D., Nosco Consulting


This student research project was designed to take the first steps toward determining whether any positive changes on spinal gravity lines can be detected after a trial of flexible orthotic devices on subjects who exhibit asymmetric flexible pes pianos and spinal towering.


This study was approved by an IRB at Logan College of Chiropractic. Seven students who passed all entry criteria and gave, in writing, informed consent to participate were enrolled in the study. Study subjects were fitted with orthotics that they wore for 2 weeks. Anteroposterior full-spine radio­graphs were obtained both pretrial and posttrial, with the posttrial radiographs taken with orthotics in place. A spinal gravity line (plumb line) was constructed in both pre- and postorthotic radiographs that ran from the level of the apex of the odontoid process and intersected with the second sacral tubercle. The right or left deviation of the odontoid versus the plumb line intersecting with the second sacral tubercle was measured on all radiographs. Data analysis consisted of descriptive statistics and a two-tailed t test.



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