A forceful trauma (e.g., sports injury or fall) to any of the figure joints can result in finger dislocation (movement of bone out of its original position). The thumb consists of only two joints, whereas the other four fingers consist of three joints, which allow it to bend forward, downward, and sideways. These joints are:
Thumb dislocations are usually caused by bending the thumb backward (hyperextension) beyond its normal range. They are the most common type of hand injuries that happen in athletes playing football and basketball while catching or blocking the fast-moving ball.
Although a thumb dislocation is not a medical emergency, delaying its treatment might increase the swelling in the finger, making the treatment difficult.
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