Knuckle Joints By: Lydia Riccomini

The metacarpophalangeal joint is the joint connecting the metacarpals to the phalanges. This joint is also known as the knuckle. And is fueled with blood from the dorsal and palmar metacarpal arteries, princeps pollicis artery and radialis indicis artery. Nerve inputs are received from thepalmar digital branches of the median nerve. There are many muscles that all help flexion, extension, abduction, and adduction in the knuckle joint.


Articular cartilage is the connective tissue for connecting joints. It provides a smooth and lubricated surface for bones to move with very little friction. Articular cartilage cannot heal or repair itself, as it does not have blood vessels, lymphatics, or nerves to aid it.


The dorsal interossei muscles sandwich three fingers, the index, middle and ring finger. The muscles help move the fingers more independently from each other, they are found running dorsally with the transverse metacarpal ligament.


The collateral ligament are strong, rough cords that connect to each finger (and toe joint). The palmar ligaments are unusual, thick, and dense. They are placed in between and connected to the collateral ligaments. They are loosely attached to the metacarpophalangeal joint (and others).


Metacarpophalangeal joints are hinge joints that allow the most amount of of flexibility and movement in the fingers. Ex: Baseball and football. In baseball, in order for a person to grab a baseball or bat, they need the most amount of range they can get. Same goes for football, they need as much range of motion as they can get to grab the football.


5. Hand/finger tendon glide

Hand/finger tendon glide exercise

• Start with the fingers extended straight out.

• Make a hook fist; return to a straight hand.

• Make a full fist; return to a straight hand.

• Make a straight fist; return to a straight hand.

In order to prevent injury to the metacarpophalangeal, refrain from over extending or pulling out the joint, when an over extension occurs the the bone pops out of its socket, this causes the articular cartilage to tear, pulling apart the joint causes the articular cartilage to be potentially torn aswell as pop the finger.


Publications, H. H. (n.d.). 5 exercises to improve hand mobility. Retrieved April 13, 2017, from

Fox, A. J., Bedi, A., & Rodeo, S. A. (2009, November). The Basic Science of Articular Cartilage: Structure, Composition, and Function. Retrieved April 11, 2017, from

Metacarpophalangeal Joints. (n.d.). Retrieved April 11, 2017, from

Cleary, A. (n.d.). Dorsal Interossei muscles (hand) | Radiology Reference Article. Retrieved April 11, 2017, from

Schmidler, C. (2016, November 20). Anatomy of the Hand and Wrist: Bones, Muscles, Tendons, Nerves. Retrieved April 11, 2017, from


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