[Finger anatomy series 3/3] 3.The Proximal Interphalangeal joint or PIPNow that you know about the flexor tendons, the function of the pulleys and where they tend to pull, you should be able to guess why the PIP joint is so important!The PIP is the main joint that dictates the forces along the pulleys due to the position and angle of pull from the forces of the tendons.Demonstrated here is more of a hanging grip or an open handed grip. The angle of the PIP in this image is quite large and thus the resultant forces on the pulleys is minimal !! The SMALLER angle in the PIP = GREATER forces on the pulleys! Take this into consideration when thinking about how you grip your holds! I&;ll demonstrate with some more pictures in the following posts!