The primary ligament between the metatarsals is the deep transverse metatarsal ligament (DTML).
Here's a breakdown:
- Deep Transverse Metatarsal Ligament (DTML): This is the most significant ligament connecting the metatarsals. It is a strong band of tissue that runs transversely across the plantar aspect (bottom) of the metatarsal heads. It connects the distal ends of the metatarsals. There are effectively four short segments spanning the metatarsal heads.
- Function: The DTML's main function is to maintain the alignment of the metatarsal heads and prevent them from spreading apart. It contributes to the stability of the forefoot and helps distribute weight evenly across the metatarsal heads during weight-bearing activities like walking and running. It also helps to limit splayfoot deformity. The DTML also blends with the plantar plates of the metatarsophalangeal (MTP) joints.
In summary, the deep transverse metatarsal ligament is crucial for the stability and function of the forefoot by connecting the metatarsals.
