RT Book, Section A1 DeAngelis, Michael A. A1 Wald, David A. A2 Sherman, Scott C. SR Print(0) ID 1103537393 T1 Wrist T2 Simon’s Emergency Orthopedics, 7e YR 2014 FD 2014 PB McGraw-Hill Education PP New York, NY SN 978-0-07-181965-7 LK accessemergencymedicine.mhmedical.com/content.aspx?aid=1103537393 RD 2024/10/06 AB The wrist is comprised of eight carpal bones that articulate with the radius proximally and the metacarpals distally. Motions include flexion, extension, radial deviation, and ulnar deviation. The carpal bones are divided into a proximal row of four bones and a distal row of four bones (Fig. 12–1). The proximal row, from radial to ulnar surfaces, includes the scaphoid, lunate, and triquetrum. The distal row, from radial to ulnar surfaces, includes the trapezium, trapezoid, capitate, and hamate. The pisiform, a sesamoid bone enclosed in the sheath of the flexor carpi ulnaris tendon, lies adjacent to the volar surface of the triquetrum and does not articulate with the forearm bones or with any of the remaining carpal bones.1