During fixation of Bennett's fracture, which muscle hinders it :
Following are the deforming forces in Bennett's fracture :

At the distal fragment, it is the adductor pollicis.
At the proximal fragment, it is the abductor pollicis longus.
Extensor pollicis brevis
Flexor pollicis brevis
Flexor pollicis longus
Abductor pollicis longus