The relationship between foot function and theta angular correction
Theta relates directly with the ability of any device, custom orthotic, arch supporting/foot controlling shoe modification or insert, constructed from any material, by any means of fitting or fabrication, to change foot function during weight-bearing use.
Theta: Quantified angular correction
Clinical research associated with Quantified Varus Embodiment (Theta) between l984 and l990 resulted in the design of an orthotic device recorded as application # 7,624,550 in the United States Patent Office. This invention relates to the use of devices that support the arches of the foot, reduce rear foot pronation, and otherwise improves foot function. It specifically relates to those foot control devices with angular design characteristics (Theta) measurements.
The posture-controlling, arch-supporting design is quantified; but more than that, it embodies those preferred levels of theta observed in over 4000 clinical trials. The highest theta observed in all orthotics, other than the theta-orthotics, is 22 degrees. Theta-Orthotics begins at 20 degrees and doubles its therapeutic value every 5 degrees up to 40 degrees.
This custom orthotic is made from a material that completely resists permanent deformation, provides optimal shock absorption, and fits in more shoe types than any other device on the market. It is a system for foot control using scientific techniques and research as the basis for its design. Clinically, it unites orthotic therapy with the basic principles of human biomechanical function
The same reduction in foot and heel symptoms, knee pain, back pain and improvement in foot function and posture associated with the use of any previously designed foot control device is observed with the Theta-Orthotics at levels 100 to 600 percent greater.
Techniques for Measuring Theta
Visual Technique: This technique was the first to be used. It demonstrates visually the physical characteristic of Theta in any orthotic device. When the optics and proper points are used, this an easy, moderately accurate way of measuring the angular correction known as Theta. This technique is currently utilized for quick estimates of QVE in the clinical setting and for demonstration purposes.
 |
 |
|
 |
||
 |
 |
The bottom of the foot at the critical point is a hyperbolic curve. By definition, theta is measured in the central 50 percent of that curve. By definition, the above orthotic has only 20 degrees of theta correction. The high medial flange in this design does not affect function or theta measurement as defined.
Trigonometric Technique: This is the method we use in our Labs to check finished Quantified orthotics and to quantify our production tools at levels of 10, 15, 20, 25, 30, 35, and 39 degrees Theta. It uses the width of an orthotic device (D-E) at the STJ area, and the measured distance between A-B=D-E/2. The Law of angles defines the formula tan(theta)(A-B) = (A-C) . The distance between the superior surface of the orthotic and the horizontal plane maintained during gait can be measured with calipers and used to determine theta in any orthotic device.
Protractor technique: This process sections the orthotic from medial to lateral in the frontal plane, at the corresponding TNJ area of the Orthotic. A protractor can then be used to measure Theta . This is a very accurate method used in the lab to measure and visualize theta directly.
 |
 |
 |
|
|
|
|
|
|
||
Theta is the physical angle of support applied to the foot during function by any arch support or orthotic device. It is, in fact, the part of any
orthotic-support device that relates directly to the benefit received. When theta correction is measured, it is observed that there is no more than 20 degrees in any orthotic except Theta-Orthotics. Every 5 degrees of theta angular correction almost doubles the therapeutic benefit of the foot control device. This makes
theta-orthotics more than 400 percent better than any other custom orthotic on the market.
Theta-Orthotics
10764 South Pine Grove Way
South Jordan, Utah 84095
1-800-558-4382