I waIIiiiI was the first person to statistically link a short leg to a pelvic unleveling initiated by abnormal foot pronation.

This research was part of a series of discoveries that ultimately led to a therapy that, in many cases, permanently eliminates chronic musculoskeletal pain without the use of drugs or surgery. This therapy is called Rothbart Proprioceptive Therapy, in which I use a series of tests, proprietary computer analyses, custom designed Rothbart Proprioceptive Insoles and ongoing monitoring to address all of the changes in the patients condition and necessary changes in prescriptions, until the chronic muscle and/or joint pain is eliminated.

Here is an excerpt from the article, "Relationship of Functional Leg-Length Discrepancy to Abnormal Pronation" published in the Journal of the American Podiatric Medical Association (Rothbart, 2006), that supports this discovery:

“The objective of this study was to determine whether a correlation exists between abnormal pronation and functional leg-length discrepancies. Visual assessment and a pelvic thrust maneuver were used to identify the functionally short leg in 56 indigenous Mexicans (20males and 36 females; mean age, 33 years; mean weight, 59 kg; and mean height,1.60 m). The Foot Posture Index was used with a modified stance position to identify the more pronated foot. The posterosuperior iliac spines were used to identify the “relative” position of the innominate bones. The raw data obtained from this study were evaluated using the McNemar test for paired proportions. A significant positive correlation was found between abnormal pronation and hip position and between hip position and functional leg-length discrepancy.

These results are consistent with a theoretical ascending dysfunctional pelvic model: Abnormal pronation pulls the innominate bones anteriorly (forward); anterior rotation of the innominate bones shifts the acetabula posteriorly and cephalad (backward and upward); and this shift in the acetabula hyperextends the knees and shortens the legs, with the shortest leg corresponding to the most pronated foot.”

Other researchers have also linked abnormal pronation (hyperpronation) to an anterior rotation of the innominates (Khamis et al, 2007).

Reference

Rothbart BA 2006. Relationship of Functional Leg-Length Discrepancy to Abnormal Pronation. Journal American Podiatric Medical Association;96(6):499-507