The joint is technically called "metacarpophalangeal", and it is
a condyloid joint.
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Metacarpophalangeal joint
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The second through fourth metacarpophalangeal joints are
condyloid joints. The first metacarpophalangeal joint is a saddle
joint.
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metacarpophalangeal joint
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The metacarpophalangeal joint is typically known as the pastern.
This is the joint between the metacarpus (cannon bone) and the
first phalanx (the pastern bone).