Figure 6.

Example of thumb cords (commissural and radial). (left) In this example the tip of the thumb cannot be moved away from the base of the index finger, and it cannot be abducted so that the thumb and palm can be placed flat on a table top. (right) The cords can be visualised and palpated to create a mental image, and the aliquots of a single dose can be injected around the junction site of the two cords as indicated by dots. Occasionally, thumb cords can be thick enough to require a second injection of CCH 30 days later. Photo and schematic diagram courtesy of LC Hurst.