In 2002, a paper was published (Rothbart 2002) in the Journal of Bodywork and Movement Therapies describing a previously unreported embryological foot structure, the Primus Metatarsus Supinatus foot structure (AKA Rothbarts Foot). The etiology of this foot structure is linked to an incomplete embryological development of the talar head (the bone that sits on top of the heel bone).
3 Minute Screening
Below is a screening protocol to determine the level of confidence (LC) of whether the Rothbarts Foot is present or not:
- (1) A positive Knee Bend Test indicated by an inward and downward twisting of the ankle when the knees are bent (see animation below).
- (2) Uneven wear patterns in the heels and/or soles of the shoes (see animation below).
- (3) A deep 1st web space
Interpretation of Findings:
- If one of the three screening tests is positive, there is a 65% Level of Confidence that the individual has Rothbarts Foot.
- If two of the three screening tests are positive, there is a 75% Level of Confidence that the individual has Rothbarts Foot.
- If all three of the the screening tests are positive, there is a 85% Level of Confidence that the individual has Rothbarts Foot.
 Positive Knee Bend Test
Valgus rotation (pronation) of the heel bones only with knees bent
 Uneven wear patterns on the soles of your shoes
 Deep 1st Web Space
Gold Standard for determining the presence of Rothbarts Foot (or not):
Measure the Primus Metatarsus Supinatus Value (PMs Value). The protocol for taking this measurement is described in Medial Column Foot Systems: An Innovative Tool for Improving Posture, or on my research blog.
False Negative can occur with a plantarflexed first ray.
Rothbart BA, 2002. Medial Column Foot Systems: An Innovative Tool for Improving Posture. Journal of Bodywork and Movement Therapies (6)1:37-46