A therapeutic hand exercise device comprises one or more pliant sleeves (5) for attachment to one or more digits of a human hand, a chamber (4) provided in at least a dorsal region of the or each pliant sleeve (5), a liquid inlet to the chamber and a pump (3) for supplying pressurised liquid to the or each chamber. Each pliant sleeve (5) is movable between a relaxed state and a stiffened state in which the pliant sleeve forms a substantially rigid elongate member for holding a finger disposed within the sleeve in an extended position. A resilient member (6) is fitted to the Palmar side of each pliant sleeve which returns the finger to a state of contracture.