Collagenase Clostridium Histolyticum Injection with Precise Needle Length Adjusted by Silicone Tube Interposition for Dupuytren Contracture.

We describe our injection method for Collagenase Clostridium Histolyticum using a medical silicone tube after determining the optimal depth by ultrasonography. This procedure adjusts the exposed needle length to the planned injection depth by placing a sterilized silicone tube over the needle. The restricted depth provides not only precise injection into the middle of the cords but also avoids needle tip migration through the cord and into the vital structures, which prevents possible complications. This method is safe and simple.