The clenched fist syndrome: case report of a clinical rarity of special interest for psychiatrists and hand surgeons

BACKGROUND: The Clenched Fist Syndrome (CFS) is a type of a psychiatric disorder, in which the patients show flexion finger contractures. Although no organic etiology can be identified, the syndrome in most cases presents with pain and paradoxical stiffness. CASE PRESENTATION: We, herein, report the case of a 52-year old woman with a 6-month history of progressive hand flexion contracture and intermittent numbness in the first 3 fingers, mimicking carpal tunnel syndrome. On examination, all digits, including the thumb, were held in a tight flexion at the metacarpal and interphalangeal joints. Passive digital extension was painless in all fingers. Physical examination did not reveal any joint tenderness, joint or tendon sheath swelling. X ray was performed and did not show any abnormalities. Neurological examination did not reveal any organic etiology. CONCLUSIONS: CFS is believed to be a conversion disorder, i.e. unconsciously motivated and produced, whereas others consider it a factitious disorder, i.e. unconsciously motivated but consciously produced. Surgical treatment is not indicated, as it can worsen the symptoms. The related literature is discussed. We conclude that CFS should always be considered in patients with unexplainable flexion hand contractures, especially in the presence of a positive psychiatric history.