ABSTRACT
Wrist motion is passive as no tendons originate from or insert into the carpal bones except for the sesamoid pisiform. The wrist bones are arranged in two rows, proximal and distal, with only the scaphoid bridging the two (Figure 46.1). Under compressive loads, this scaphoid bridge prevents the two rows from collapsing in a zigzag pattern. This same positioning also places the scaphoid and its surrounding ligaments at greatest risk of injury with compressive loads.
