Functional outcome of neglected perilunate dislocations treated with open reduction and internal fixation.

INTRODUCTION

Management of neglected perilunate dislocations is controversial. The various procedures such as open reduction and internal fixation (ORIF), proximal row carpectomy, lunate excision, and wrist arthrodesis have been advocated. The aim of our study was to evaluate the functional outcome of neglected perilunate dislocations managed by ORIF.

MATERIALS AND METHODS

Over a period of 10 years (1996 to 2006), 14 patients with neglected perilunate dislocations (undiagnosed or untreated for 6 weeks or more) were managed by ORIF. Six patients had dorsal trans-scaphoid perilunate dislocation, 6 patients had volar lunate dislocation while the remaining two had a dorsal perilunate dislocation The results were evaluated by clinical scoring system of Cooney et al.

RESULTS

The average followup was 4.1 years (range 2-12 years). All except one of the patients operated earlier than 5 months had good results. Of the four patients operated after 5 months, two had a fair result while two had a poor outcome. Chondral damage to the capitate was noted intraoperatively in both the cases with poor outcomes. The two patients were found to have avascular necrosis (AVN) of the lunate; however, functional outcome was fair in both, and both were able to return to their profession.

CONCLUSION

We observed favorable functional results of ORIF in neglected perilunate dislocations up to 5 months after injury. The development of AVN or midcarpal arthritis was not a major disabling factor as long as stability of wrist has been restored. Beyond 5 months, an alternative surgical procedure such as proximal row carpectomy should be contemplated as results of ORIF have not been good uniformly.