![]() These are the collateral ligaments There are two collateral ligaments that connect the forearm to the wrist, one on each side of the wrist.Īs its name suggests, the ulnar collateral ligament (UCL) is on the ulnar side of the wrist. Two important ligaments support the sides of the wrist. In the wrist, the eight carpal bones are surrounded and supported by a joint capsule. The ligaments around a joint usually combine to form a: Joint CapsuleĪ joint capsule is a watertight sac that surrounds a joint and contains lubricating fluid called synovial fluid. Ligaments are soft tissue structures that connect bones to bones. In the wrist, articular cartilage covers the sides of all the carpals and the ends of the bones that connect from the forearm to the fingers. We have articular cartilage essentially everywhere that two bony surfaces move against one another, or articulate. The function of articular cartilage is to absorb shock and provide an extremely smooth surface to make motion easier. It is slippery, which allows the joint surfaces to slide against one another without causing any damage. Articular cartilage is white, shiny, and has a rubbery consistency. It is thinner in joints such as the wrist that don't support a lot of weight. Articular cartilage can be up to one-quarter of an inch thick in the large, weight-bearing joints. This means that what we call the wrist joint is actually made up of many small joints.Īrticular cartilage is the material that covers the ends of the bones of any joint. One reason that the wrist is so complicated is because every small carpal bone forms a joint with the bone next to it. The metacarpals attach to the phalanges, which are the bones in the fingers and thumb. These are the long bones that lie within the palm of the hand. The proximal row of carpal bones connects the two bones of the forearm, the radius and the ulna, to the bones of the hand. The distal row is made up of the trapezium, trapezoid, capitate, hamate, and pisiform bones. Meets the proximal row a little further toward the fingers. The second row of carpal bones, called the: Distal Row Beginning with the thumb-side of the wrist, the proximal row of carpal bones is made up of the scaphoid, lunate, and triquetrum. Is where the wrist creases when you bend it. ![]() These bones are grouped in two rows across the wrist. ![]() The wrist itself contains eight small bones, called: Carpal Bones There are 15 bones that form connections from the end of the forearm to the hand. The important structures of the wrist can be divided into several categories.
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