Which device is a semirigid plastic molded insert to correct flexible pes planus?

• A. UCBL insert
• B. Thomas heel
• C. Scaphoid pad
• D. Metatarsal pad

Answer: (A)

Flexible pes planus is best managed with an orthosis that provides arch support and hindfoot control. The UCBL insert is a semirigid plastic device molded to the foot that supports the medial longitudinal arch and stabilizes the hindfoot by contouring under the heel and around the midfoot. This custom, molded approach helps align the talonavicular joint and reduce excessive pronation throughout gait, which is precisely what’s needed for flexible flatfoot.

The other options don’t fit as well. A Thomas heel is a more rigid heel-based modification that alters arch height but is not a full semirigid, foot-molded insert for comprehensive arch and hindfoot control. A scaphoid pad is a simple under-navicular pad aimed at reducing pronation, not a full arch-supporting insert. A metatarsal pad shifts load to the forefoot and doesn’t correct hindfoot alignment or the arch.