[Perilunate dislocations and fracture-dislocations of the wrist, a review of 17 cases].

INTRODUCTION: The authors present the results of a retrospective series of 17 cases of dislocations or perilunate fracture-dislocations of the carpus, treated in emergency (period of less than 7 days). The objective aim of our study was to evaluate the radioclinical fate prognosis of these lesions pathologies and their social commitment impact.

PATIENTS AND METHODS: It is a retrospective study covering the period from July 2004 to December 2009 (or 54 months). Were included in the study, patients hospitalised for a pure dislocation or a perilunate fracture-dislocation authenticated confirmed by an x-ray postero-anterior and lateral views were included. The series included 15 men and two women, nine manual workers, with an average age of 38.9 years. Based on Herzberg radiological classification, the series included six pure perilunate dislocations (35%) and 11 fracture-dislocations (59%) including seven forms trans-scapho-perilunate and four fractures of the lower end of radius. On the profile x-ray, 16 of the lesions were posterior displacement, including 12 stages I lesions (lunatum in place under the radius), and four stage II (lunatum dislocated in front of the radius). A patient had an anterior dislocation stage II, associated with a radial styloid fracture. All patients were operated using surgical treatment, percutaneous, either open pit, or open approaches combining with broaching scapholunate, scaphocapitate and triquetrolunate pinning. Then, an immobilization for 6 weeks was put in place and was performed using a forearm cast. Rehabilitation began as early as the removal of osteosynthesis was done at pin removal.

RESULTS: The average decline follow-up in the series was 26 months. The mean score of Cooney was 63/100. There were two excellent results, two good results, seven middle moderate results, and six bad results. The average Quick-DASH score was 24.6/55 and the PRWE 41/150. The average duration of the work stoppage leave was 8 months, including one retired. The average of flexion-extension arc of the traumatized side was 77% (101°) in comparison to the healthy side. The average strength of the traumatized side was 71% (34kg) in comparison with the healthy side. The average radial-ulnar tilt arc of the traumatized side was 67% (37°) in comparison with the healthy side.

DISCUSSION: There is no formal radioclinical prognostic in the radioclinic correlation. However, it seems to emerge that the timing and the type of support treatment bear the most important prognostic guarantors of a better result factors. Perilunate fracture-dislocations have major arthrogeneous arthrogenic potential, yet with a despite functional outcome consistent allowing resumption of recovery of past previous activities. It would seem that perilunate fracture-dislocations have a better functional outcome than those of pure dislocations. Thus, this work is the beginning of a long-term study, including a larger number of patients.