Isolated dislocation of hamate or pisiform is uncommon. The simultaneous dislocation of both hamate and pisiform is even rare. A 57-year-old male suffered from simultaneous dislocation of left hand hamate, pisiform, the 4th and the 5th metacarpal bone due to crushing injury by a heavy gas cylinder. The speculated mechanism is a combination of force from different direction, which extruded the hamate and pisiform from their ligamentous fixation. The patient was treated with close reduction and percutaneous Kirschner wire fixation without any ligament repair. After one year, he has returned to his original heavy work with a satisfactory 75 points of modified Mayo wrist score.