Figure Legend: Bennett's and reverse Bennett's fractures.  These are fracture dislocations of the thumb and small metacarpal bases, respectively.  They are each inherently unstable because of the resultant unopposed distracting forces of remaining muscle tendon attachments on the larger fracture fragment.  The abductor pollicis longus displaces the thumb Bennett's fracture, and the extensor carpi ulnaris displaces the small finger reverse Bennett's fracture.  Each of these requires at least temporary internal fixation to reliably maintained reduction.
 

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