For ease of reference, experts number the five MTP joints one through five, from the big toe to the baby toe. This number refers to both the proximal phalanges of the toes and the metatarsal bones of the feet. The first MTP joint has a capsuloligamentous complex that keeps it stable. This complex contains a protective fibrous capsule, a collateral ligamentous complex, a plantar plate, an extensor hood, and numerous ligaments. The remainder of the joints, excepting the fifth, also have these complexes. The complexes of the other joints contain significantly fewer structures.
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