By understanding the evolution of theoretical biomechanical models we can better appreciate today’s science and how to best utilise it for our patients’ benefit. Here are some key features of the most well-known theories:
Subtalar Neutral Theory:
- Subtalar axis is neutral, meaning neither pronated nor supinated
- Bisection of posterior calcaneus is vertical
- Metatarsophalangeal joint line is perpendicular to the bisector of posterior calcaneus
- Foot is rotated outward approximated 7-10 degrees
Sagittal Plane Facilitation Theory:
- Hallux limitus is a dysfunction for full propulsion
- Lack of full propulsion can lead to other pathologies such as plantar fasciitis, flat foot, chronic back pain, etc
- Hallux limitus results in full body compensation such as a propulsive gait with delayed heel lift- off, overload to lateral column of foot, flexed body position, etc
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