Kadar A, Haddara MM, Fan S, et al. - This study was undertaken to investigate the impacts of a thermoplastic ring, acting as an external pulley, on flexor tendon biomechanics and finger range of motion (ROM) after pulley venting. In this study, 15 cadaveric digits were tested using an in vitro active finger motion simulator. Researchers assessed loads induced by flexor digitorum superficialis and flexor digitorum profundus as well as joint ROM with sequential sectioning of the A2, A3, and A4 pulleys compared with an intact pulley condition. According to the findings, the application of thermoplastic rings acting as external pulleys was found to be an effective, noninvasive, and reproducible approach to restore flexor tendon biomechanics and digit ROM after pulley venting.