Isolated dislocation of the pisiform bone in a 10-year-old boy

Introduction. Isolated dislocation of the pisiform bone is a very rare condition due to robust ligamentous attachments that stabilize the pisiform to the carpus. This type of injury is usually a result of direct trauma to the ulnar and volar aspect of the wrist. Case outline. We present an isolated dislocation of the pisiform, with no other carpal bone injuries, treated successfully with closed reduction. Diagnosis was based on clinical findings, plain radiographs, and computer tomography examination of the wrist. Elongation and partial rupture of the pisometacarpal ligament was found on magnetic resonance imaging. Conclusion. Fracture and dislocation of the pisiform is an extremely rare injury in children, which could be easily neglected or misdiagnosed. Closed reduction with plaster cast immobilization should always be considered as the first method of treatment in the pediatric population, since the conservative approach provides excellent results.