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The wrist is a complex joint that bridges the hand to the forearm. It is actually a collection of multiple bones and joints. The bones comprising the wrist include the distal ends of the radius and ulna, 8 carpal bones, and the proximal portions of the 5 metacarpal bones (see the images below).Bones of the wrist, palmar view. Bones of the wrist, enlarged view.he proximal row is found at the level of the distal wrist crease and includes the scaphoid, lunate, triquetrum, and pisiform. The second row of carpal bones, the distal row, is made up of the trapezium, trapezoid, capitate, and hamate; the distal row articulates with the bases of the 5 metacarpal bones.
The hip joint is a ball-and-socket joint made up of the top of the thigh bone or femur (ball) and the acetabulum (socket) in the pelvis. The ends of the bone, as with all joints, are covered with a smooth, cushioning layer called articular cartilage. The articular cartilage is what allows the bones to glide smoothly.