What is the most common cause of cuboid dysfunction?

• A. Chronic peroneal muscle dysfunction
• B. Calcaneo-cuboid ligament insufficiency
• C. Inversion ankle sprain
• D. Plantar fasciitis

Answer: (A)

Cuboid dysfunction is most often driven by problems in the muscles that stabilize the lateral side of the foot, especially chronic peroneal muscle dysfunction. The peroneus longus tendon runs under the cuboid and helps keep the cuboid in its correct position during walking and weight bearing. When these muscles are weak, fatigued, or overworked over time, they pull unevenly on the cuboid, making it sublux or move out of its normal alignment. That repetitive abnormal force is the usual reason the cuboid becomes dysfunctional, leading to lateral foot pain and limited motion.

Other factors can contribute—an inversion ankle sprain can precipitate a cuboid issue, and issues with the calcaneo-cuboid ligament can affect stability—but they’re less commonly the root cause compared to chronic peroneal muscle dysfunction. Plantar fasciitis, while a common foot problem, doesn’t typically cause cuboid dysfunction.