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BACKGROUND:It's a rare injury, results from violent hyperextension, violent abduction or by direct injury. AIM: To diagnose, classify and treat a case of sesamoid fracture. MATERIAL AND METHOD:We present a case of an adult man, 37 years old, who suffered a violent abduction of the right thumb. The X-ray examination demonstrated a fracture of the ulnar sesamoid of the thumb. The fracture was treated by immobilization with thumb spica splint for two weeks. RESULTS: Follow up at three weeks, six weeks and eight months after the injury, shows total functional recovery of the thumb and healing of the fracture. CONCLUSION: Fracture of sesamoid bones of the thumb is a rare injury, not usually diagnosed, but it has good prognosis when treated properly.

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