Fifth tarsometatarsal joint

The fifth tarsometatarsal joint is the synovial articulation between the base of the fifth metatarsal and the cuboid bone. This joint is part of the lateral column of the foot and is characterized by a relatively flat articular surface, which allows for a greater range of motion compared to the medial tarsometatarsal joints. The joint capsule is reinforced by dorsal, plantar, and interosseous ligaments, with the plantar tarsometatarsal ligament (cuboid-fifth metatarsal, pCb-M5) being a key stabilizer; this ligament can have one or two bands and shows anatomical variation among individuals.

The lateral aspect of the joint complex, including the fourth and fifth tarsometatarsal joints, is notable for its increased mobility and relatively weaker ligamentous support, which predisposes it to pure dislocations and injury patterns distinct from the more rigid medial column.The mean width and height of the lateral cuboid articulation (which includes the fifth tarsometatarsal joint) are approximately 16.74 mm and 12.78 mm, respectively, with the lateral facet being wider and shorter than the medial facet.