What orthotic feature is critical in preventing overpronation for a flexible rearfoot?

• A. A heel lift
• B. A medial (or varus) rearfoot post
• C. An arch support
• D. A metatarsal pad

Answer: (B)

A medial (or varus) rearfoot post is crucial for preventing overpronation, particularly in individuals with a flexible rearfoot. Overpronation occurs when the foot rolls inward excessively during the gait cycle, which can lead to various musculoskeletal issues. A medial rearfoot post is designed to provide increased support and stability on the medial side of the foot (the inner side). By creating an inclined surface on the inside of the heel, this orthotic feature effectively counters the tendency of the foot to roll inward, allowing for better alignment during weightbearing and walking.

The use of a medial rearfoot post can help control the subtalar joint's motion, promoting a more neutral position and reducing excessive pronation. This feature is particularly beneficial for flexible rearfoot types, as their structural adaptability can often lead to instability and increased pronation during activities.

In contrast, features such as heel lifts, arch supports, and metatarsal pads serve different purposes and may not directly target the overpronation issue as effectively as a medial rearfoot post does. Heel lifts primarily address issues related to leg length discrepancies or Achilles tendon issues, while arch supports provide generalized support to the arch but do not necessarily correct rearfoot motion. Metatarsal pads are