Metacarpophalangeal Joints

Question 1

Type of Joints

Answer 1

Synovial ellipsoid between rounded head of MC and concave base of prox phalanx, capable of 2 degrees of freedom

• flex/ext
• abd/add

Question 2

Supporting Ligaments and Structures

Answer 2

Strengthened post by expansion of EPL

Collateral ligts- strengthens capsule at sides
-fan from prox to distal, also attaching to palmar ligt

Palmar ligt- strengthens ant

• from ant surface of base prox phalanx
• contains two sesamoid bones in thumb attached to phalanx and MC by straight/crucial effort fibres

Deep Transverse (fingers only)- continuous with palmar interosseous fascia
-between MCs