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Page Revision Date - 14 Jun 2015 06:06
Metacarpophalangeal Joint (Knuckle)
Bones: The metacarpal bone (of the hand) and the first phalanx (bone of the finger).
Cartilage: There is a small portion of articular cartilage on the ends of each bone.
Ligament: There is a transverse metacarpal ligament that wraps around the end of each bone, but leaves a small groove on the top of the knuckle to allow for the connection of a tendon.
Tendon: There are several tendons that connect at this joint this way multiple muscles can work together to create the fine movements we can make with out fingers.
Range of motion: Flexion at this joint is able to pull the first phalanx and the rest of the fingers downward at about 90 degrees. Extensors are able to pull the fingers open at around 35 degrees upward.
Manipulation: During a grab or grope the finger can be grabbed and extended till the joint snaps.
Injury: This is THE joint to use when throwing a punch and should be the only point of contact as if the next joint down makes contact the metacarpophalangeal joint will over flex and could rip/pop out of place. Punching impact also causes the metacarpals to expand, hence why boxers wrap their hands.
Stretching: Stretching the the fingers down and back (consistently) will make this joints be more limber and react better under impact with less injury (not to say there wont be any), impact being both from a punch and to any random finger bending injury.
For information on additional joints please refer back to the Joints page.
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