Abstract: An arm board for clinical use including a first elongated inclined ramp joined to a relatively shorter second inclined ramp at an angle to form a fulcrum over which a human wrist may be hyperflexed. A base is provided for resting on various surfaces. A hand grip is also provided for gripping by the patient. Means may be provided to set the angle at the fulcrum to accommodate various patients hand sizes and to maximize flexion.