Neglected trans-scaphoid trans-styloid volar dislocation of the lunate

An Unusual Localization of Lunate in a Transcaphoid Volar Lunate Dislocation: Current Concepts

Perilunate dislocation and fracture dislocations are rare injuries corresponding to 10% of all carpal injuries. They usually come with high-energy trauma, with associated injuries representing 61%. Volar lunate dislocation or fracture-dislocation accounts for 3% of perilunate injuries. We present a case of a 42-year-old polytrauma male, transmitted to our department 48 hours after a car accident with a trans-scaphoid volar lunate dislocation. During operation, the lunate was displaced volarly to the ulnar side of the wrist, forward to the styloid process of the distal ulna, while the scaphoid fracture appeared at the waist with comminution, and the proximal pole of the scaphoid protruded under the dorsal capsule. Carpal injuries are often missed out in polytrauma patients, and these injuries are underestimated because of the severity of the other visceral or extremity lesions. Untreated or improperly treated, those injuries lead to serious morbidity and loss of function. Therefore, good functional prognosis with decreased percentage of complications can be achieved following early recognition and early open surgical ligamentous complex repair.

Extreme proximal migration of dislocated lunate over carpal ligament - A case report

Dislocation of the lunate and proximal pole of the scaphoid with displacement of the fragments proximal to the radiocarpal joint, characterized as a total dislocation, is very rare, with only six cases reported. Dislocated lunate are generally located around the radiocarpal joint or within carpal ligament. However, there have been no reports of dislocated lunate over the carpal ligament. We present a patient with volar dislocation of the lunate that featured extreme migration to approximately 6 cm proximal to flexor digitorum superficialis through the transcarpal ligament.

Total volar extrusion of the lunate and scaphoid proximal pole with concurrent scapholunate dissociation

This article describes a case of a 24-year-old man with a total volar extrusion of the lunate and scaphoid proximal pole with concurrent scapholunate dissociation. The viability of the lunate and the proximal pole of the scaphoid are at high risk in this type of injury. Scaphoid nonunion, avascular necrosis of the lunate and proximal pole of the scaphoid, and carpal instability are inevitable unless the blood supply is restored. Thus, proximal row carpectomy at injury may be an acceptable option to avoid these complications and late sequelae, including chronic wrist pain and dysfunction. However, the authors attempted accurate reduction of the extruded bones and internal fixation.Final radiographs and magnetic resonance imaging 12 years postoperatively showed healing without avascular necrosis. Carpal indices involving the scapholunate angle, radiolunate angle, and carpal height ratio were similar in both wrists without evidence of carpal instability or collapse. Range of motion and grip power were 75% and 76%, respectively, compared with those of the uninjured wrist. Clinical scores showed good results, and the patient reported no pain during activities of daily living and was satisfied with his surgical results. Open reduction and internal fixation can be a viable option in this rare pattern of injury.

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.

Transstyloid, transscaphoid, transtriquetral perilunate dislocation - A late presentation

Transstyloid, transscaphoid, transtriquetral perilunate dislocations are extremely rare carpal dislocations. We report a 24-year-old male who presented with this rare injury pattern four weeks after sustaining trauma. The patient underwent open reduction and internal fixation via dorsal approach. Reduction was assisted by the use of Joshi's Distraction System. Scaphoid fracture healed by 16 weeks. At 2 years follow-up patient has good range of motion around wrist without any discomfort.

[Open transscaphoid perilunate dislocation with proximal displacement of the lunate and proximal scaphoid]

The authors report a case of dorsal transscaphoid perilunate dislocation which is noteworthy because there was significant anterior displacement of the lunate together with the proximal part of the scaphoid. The lunate was propelled in front of the radial epiphysis and the proximal part of the scaphoid ended up in front of the metaphyseal part of the radius. An emergency partial proximal row carpectomy was performed, preserving the distal part of the scaphoid. Good anatomic and functional result was observed at 6 years follow-up.

Long-term follow-up of an undiagnosed trans-scaphoid perilunate dislocation demonstrating articular remodeling and functional adaptation

The most common perilunate dislocation is the trans-scaphoid dorsal perilunate variant. It is estimated that up to 25% of perilunate injuries are diagnosed late. We report 66-year follow-up of an unreduced, previously undiagnosed trans-scaphoid perilunate dislocation of the wrist. At follow-up, unique post-traumatic articular remodeling was seen on wrist radiographs, and the patient had only a mild functional deficit.