A method of treatment of Bennett's fracture is described. A Kirschner wire is drilled obliquely through the base of the first metacarpal bone and traction is applied in a distal, ulnar and palmar direction in order to counteract the dislocating action of abductor pollicis longus and the flexor muscles. The advantages of the method are: 1) It is technically easy and practically without complications. No important structures are liable to be damaged. 2) It can be used in those cases where the palmar fragment is very small. 3) It can be used for comminuted fractures. 4) It can be used in neglected cases where malunion has occurred. 5) It can be used when there are other fractures of the first metacarpal or adjacent bones. 6) It allows exercises of all the finger joints during the whole period of treatment.