What is the primary function of the 3-point pressure system in UCBL for pes varus/supination?

The primary function of the 3-point pressure system in a University of California Biomechanics Laboratory (UCBL) orthosis for addressing pes varus or supination is to create a medial directed force on the shaft of the 5th metatarsal. This design seeks to correct the alignment of the foot, particularly where there is excessive supination.

In a 3-point pressure system, the concept involves one force acting in the opposite direction of two others. By applying a medial force at the 5th metatarsal and managing the forces around the foot, this system can effectively guide the foot into a more neutral position. This alignment can help to redistribute pressure and reduce the potential for injury or excessive strain on the lateral structures of the foot, particularly in individuals who tend to supinate.

In contrasting this with the other options, enhancing medial arch support focuses on supporting the arch but does not specifically address the supination mechanics or the alignment of the metatarsals. Producing a lateral directed force on the head of the 1st metatarsal could worsen supination by encouraging further lateral deviation rather than correcting it. Maintaining heel elevation during gait is a more generalized function and does not specifically address the alignment