The Cuboid is a bone in the foot located at the base of the little toe, and part of the tarsals in the foot.
According to literature flexibility in the cuboid joint varies between individuals, hence it is not fully understood. Main movement of that tarsal bone is rotational movement with the calcaneal process functioning as a pivot. Usually cuboid and navicular move along together especially during gait (Brotzman and Manske, 2011).
Cuboid syndrome occurs when excess traction is applied from a muscle on the outside of the foot possibly causing the bone to sublux (move out of alignment). This can occur with an ankle sprain or overuse of the muscles on the outer part of the ankle. Pain may be experienced when weight bearing on the foot.
Management should follow the RICE regime and the cuboid bone may be manipulated and or taped. Using foot orthoses can help with pain relief.
Brotzman S.B. and Manske R. C., 2011, Clinical Orthopaedic Rehabilitation E-book: An Evidence-Based Approach, 3rd Edition, Elsevier, Philadelphia, PA, p: 356