During orthotic casting, the midtarsal joint should be pronated.

During orthotic casting, the midtarsal joint should be pronated.

• A. Pronated
• B. Supinated
• C. Neutral
• D. Everted

Answer: (A)

In orthotic casting, capture the foot in a position that reflects how it functions when standing and moving loaded. The midtarsal joint controls the transverse arch and forefoot flexibility, so its position during casting determines how the device will support the arch and control motion.

When the midtarsal joint is pronated, the transverse arch collapses and the navicular drops as the foot adapts to ground contact. Casting with this pronated midtarsal position allows the orthosis to provide appropriate medial arch support and to moderate excessive pronation during gait. This alignment lets the insert redistribute loads effectively and maintain a more stable medial column when the device is worn.

Casting in a neutral or supinated midtarsal position would not reflect the functional pronation pattern seen in many flexible feet, potentially under-correcting pronation or failing to support the arch adequately. Eversion pertains more to hindfoot position, whereas midtarsal pronation specifically describes the transverse-arch behavior during stance.