The Effect of Timing on the Treatment and Outcome of Combined Fourth and Fifth Carpometacarpal Fracture Dislocations.

PURPOSE:
In this study, we designed a prospective project to test the hypothesis that acute fourth and fifth carpometacarpal (CMC) fracture dislocations can be treated conservatively with good restoration of strength, range of motion (ROM), and function, whereas patients with delayed treatment of fourth and fifth CMC fracture dislocations should be treated with open reduction and internal fixation (ORIF).

METHODS:
We evaluated the results of 20 patients with acute and 6 patients with subacute fourth and fifth CMC fracture dislocations. All 20 acute CMC fracture dislocations were treated conservatively, whereas 3 of the 6 patients with subacute injuries underwent operative intervention. The sensibility, ROM, and grip strength of the hands were tested during 1-year follow-up. The Michigan Hand Outcomes Questionnaire and control radiographs were also taken.

RESULTS:
All 20 patients with acute CMC fracture dislocations showed good restoration of grip strength, ROM, and function, with an average Michigan Hand Outcomes Questionnaire score of 98 ± 2 at 1-year follow-up. Patients with delayed diagnosis who underwent conservative treatment had noticeable deformity of their injured hands, pain complaints, limited ROM at the fourth and fifth CMC joints, and decreased grip strength. The 3 patients with delayed diagnosis treated with ORIF showed good restoration of grip strength, ROM, and function.

CONCLUSIONS:
Patients with acute CMC fracture dislocations can be treated by closed reduction with good restoration of grip strength, ROM, and function. In patients with delayed presentation of CMC fracture dislocations, we recommend ORIF.

TYPE OF STUDY/LEVEL OF EVIDENCE:
Therapeutic IV.