Abstract: A dynamic splint for a joint of a limb undergoing rehabilitation. The splint having a pair of elements each comprising a first tubular strut, a second lever-like strut and an intermediate gear housing mounted on one end of the first strut. A first toothed gear is rotatively mounted on a first shaft in the gear housing and is located adjacent the first strut. A second cooperating toothed gear is rotatively mounted on a second shaft in the gear housing adjacent the second strut. The first gear is missing at least one tooth. The second gear is missing a plurality of teeth in a row. The second strut is pivoted to the second shaft and is attached to the second gear at one of a plurality of selectable positions thereabout. A cam wheel is rotatively mounted on the first shaft and is affixed to the first gear. A compression spring is mounted in the tubular first strut. A cable is affixed at one end to the cam wheel and is operatively adjustably affixed to the spring.