Which of the following is NOT an articulating surface of the 1st MTP joint?

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Multiple Choice

Which of the following is NOT an articulating surface of the 1st MTP joint?

Explanation:
The key idea is which parts actually contact each other in the joint. The first metatarsophalangeal joint consists of the metatarsal head articulating with the base of the proximal phalanx, plus articular facets for the medial (and lateral) sesamoids that sit in the groove on the metatarsal head. The dorsal capsule, however, is the fibrous capsule covering the joint on the dorsal side and does not form a bone-to-bone surface that participates in articulation. So the dorsal capsule is not an articulating surface, whereas the metatarsal head, base of the proximal phalanx, and the articular surfaces of the sesamoids are.

The key idea is which parts actually contact each other in the joint. The first metatarsophalangeal joint consists of the metatarsal head articulating with the base of the proximal phalanx, plus articular facets for the medial (and lateral) sesamoids that sit in the groove on the metatarsal head. The dorsal capsule, however, is the fibrous capsule covering the joint on the dorsal side and does not form a bone-to-bone surface that participates in articulation. So the dorsal capsule is not an articulating surface, whereas the metatarsal head, base of the proximal phalanx, and the articular surfaces of the sesamoids are.

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