Wrist what kind of joint

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Our Supporting partners are active champions who provide encouragement and assistance to the arthritis community. Hand and Wrist Anatomy The hand and wrist are made up of many different bones, muscles and ligaments that enable a wide range of movements. The following are the main structures of the hands: The wrist is formed where the two bones of the forearm — the radius the larger bone on the thumb side of the arm and the ulna the smaller bone on the pinky side — meet the carpus.

Rather than a single joint, the wrist is actually made up of multiple joints where the bones of the arm and hand meet to allow movement The carpus is formed from eight small bones collectively referred to as the carpal bones. The carpal bones are bound in two groups of four bones: the pisiform , triquetrum , lunate and scaphoid on the upper end of the wrist the hamate , capitate , trapezoid and trapezium on the lower side of the hand.

However, the ulna bone does not directly form a joint with the wrist bones. Where the radius bone meets the wrist are two rows of small round bones—four in each row—known as carpal bones:.

Together, the eight carpal bones are called the carpus. The distal carpals form five joints with the hand bones. The hand bones are called metacarpal bones. Metacarpals are long bones that connect the distal carpals to the fingers and thumb. There are several sets of joints in and around the wrist. These joints vary in type and have different motions.

Most wrist fractures are the result of a break in the radius bone at the radiocarpal joint—known as a distal radius fracture. The scaphoid is the second-most commonly fractured wrist bone. This action involves bending the wrist backward and toward the thumb, and then forward and toward the little finger.

Common everyday activities that involve this motion are hammering a nail, throwing a ball, drinking from a glass, pouring from a jug, and closing the lid of a jar.

On average, the wrist bends at an angle of 30 to 35 degrees backward during extension and 5 to 10 degrees forward during flexion in everyday wrist movements.

Learn more about the joints of the wrist and also the bones of the wrist in our Anatomy section. You can also visit www. There are three joints in the wrist: Radiocarpal joint: This joint is where the radius, one of the forearm bones, joins with the first row of wrist bones scaphoid, lunate, and triquetrum. Ulnocarpal joint: This joint is where the ulna, one of the forearm bones, joins with the lunate and triquetrum wrist bones.