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Dynamic Chiropractic – October 9, 1992, Vol. 10, Issue 21
Dynamic Chiropractic
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Dynamic Chiropractic

Reference Your Method of Mensuration

By Deborah Pate, DC, DACBR

As chiropractors, we often evaluate patients with a scoliosis. It is very important to document the method used to evaluate the patient's curvature. For comparison purposes, one should also state which method of mensuration was utilized and which levels were used for reference points. There are two common methods for evaluating curvatures in the thoracic spine:

The Ferguson's method referenced in Ferguson: Roentgen Diagnosis of Extremities and Spine 1949, which describes the following technique:

  1. Define the margin of the apical vertebrae of the curvature as well as the vertebra which defines the ends of the curve at the upper and lowermost margins of the curve.

     

  2. Place central points in each of these three vertebrae and connect them by lines forming an angle. This angle is called the angle of the curve, that is, the divergence from 180 degrees.


Ferguson vs. Cobb Methods - Copyright – Stock Photo / Register Mark

Make sure you state in your report the end vertebra and the apical vertebra, in order to re-evaluate any further change in the curve.

The second manner of measuring a curve is the Cobb's method referenced in Cobb: American Academy of Orthopedic Surgery 1948. It is still the preferred method, and is performed by:

  1. Defining the end vertebra of a curvature and placing a horizontal line on the uppermost margin of the upper vertebra and the lower end-plate of the lower vertebra.

     

  2. Extending these lines and drawing perpendicular lines to the end-plates. The angle formed by these perpendiculars is the angle of the scoliosis.

Again, one should always document which method and which reference points were used to allow accurate re-evaluation of the curve years later.

Regarding a scoliosis, there is often an associated compensatory curve in the lumbar spine, which is secondary to a primary curve in the thoracic spine. To determine which is the primary and which is the secondary curve, a tilt test can be performed. When a patient laterally flexes, the primary curve usually will not change significantly; the secondary curve will change with lateral flexion.

Determination of Primary and Secondary Curvatures in Dorsal Scoliosis - Copyright – Stock Photo / Register Mark

Primary curvature is one which cannot be changed significantly by bending to one side or the other, or tilting pelvis.

When tilting pelvis changes curvature, it is secondary or compensatory.

Once the primary curve has been determined, treatment should be directed at resolving or correcting this curve, as the secondary curve will improve once the primary curve has diminished.

Deborah Pate, D.C., DACBR
San Diego, California


Click here for more information about Deborah Pate, DC, DACBR.

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