The cuboid is a smaller cube shaped bone on the lateral side of the foot around about the middle of the foot. The bone is a bit larger than a common gaming dice. The bone takes part in three joints and works as a pulley for the tendon of the peroneus longus tendon to pass under. As this is a powerful muscle it can move the cuboid bone too much if it is not secure and stress those joints that the bone is a part of producing a problem known as cuboid syndrome. This is most likely one of the more frequent reasons for pain on the lateral side of the foot, especially in athletes. The pain normally begins quite minor and is located about where the cuboid bone is on the lateral side of the foot. The discomfort is only initially present during activity. If the exercise amounts are not lessened the condition will most likely progress and then be present after activity as well as during. At times the pain does radiate down into the foot. While this is the most common reason for pain on the lateral side of the foot, there are others such as tendinopathy and nerve entrapments.
The primary treatment for Cuboid Syndrome is relief of pain. This is generally achieved with a reduction in activity levels and the using of strapping to immobilise and support the area. Mobilisation and also manipulation is generally used to help the symptoms. Over the longer term foot orthoses may be required to limit the motion and support the lateral arch of the foot. This helps make the cuboid more stable so it is an efficient lever or pulley for the tendon to work around. Normally this strategy works in most cases. If it doesn’t there are no surgical or more advanced methods and a further decrease in exercise amounts is usually the only solution.