Bennet’s fracture dislocation

Question 1

what is abennets fracture ?

Answer 1

it is an oblique fracture at the base of the first metcarpal bone which extends to injure the carpometacarpal joint
and it is always associated with subluxation
te distl part ofthe fragmnet iis adducted by the adductor pollicus (ulnar nerve)
the metacarpal shaft displaces proximillay by the abductor pollicus longus ( radial nerve)

Question 2

what causes bennet fractures

Answer 2

caused by an axial force directed against the partially flexed metacarpal.

when a person punches a hard object

occur as a result of a fall onto the thumb

Question 3

treatment of bennets fracture ?

Answer 3

closed reduction
and thumb spica splint if minimal displacement

if displaced closed reduction
and percutaneous pinning through through the first metacarpal bone into the trapezium

or from the first metacarpal bone to the second metacarpal bones

more than 3mm - open reduction and internal fixation

also put in a thumb spica splint

Question 4

what are other first metacarpal fracture ?

Answer 4

orolando fracture - comminuted interarticular fracture through the base of the first metacarpal bone
basal split ino volar and dorsal fragmentos

extrarticular fractures
up to 30 degree angulation tolerated treat with a thumb spica splint
more tan 30 - metacarpal hyperextension