Thumb Anatomy Joint
The head of the metacarpal has a large joint surface next to the thumb proximal phalanx.
Thumb anatomy joint. It is important to understand the normal anatomy of the hand to learn more about diseases and conditions that can affect our hands. The thumb only has one ip joint between the two thumb phalanges. The thumb digit has only two phalanges (bones) so it only has one joint. Also called the knuckle, this is where the finger bones meet the hand bones.
Overview of thumb cmc joint anatomy and injury. On each finger and the thumb, . Thumb arthritis is common with aging and occurs when cartilage wears away from the ends of the bones that form the joint at the base of your . The thumb does not have a middle phalange.
The composite motion involves crossing the thumb over the palm of the hand . It permits only flexion and extension. The knuckles are joints formed by the bones of the fingers and are commonly injured or dislocated with trauma to . The thumb interphalangeal (ip) joint is similar to the distal interphalangeal (dip) .
The ip joints of the digits also work like hinges when you bend and straighten your fingers and . It's much more like an interphalangeal joint. The radius is positioned on the thumb side of the wrist, and the ulna on the little finger side. The thumb metacarpal base is concave dorsal to volar and convex radial to ulnar, whereas the trapezial concave .