• C K Spies, J Heuvens, M F Langer, P Eysel, L P Müller, D Grevenstein, and J Oppermann.
• Hand Surgery, Vulpius Klinik, Vulpiusstraße 29, 74906, Bad Rappenau, Germany. christianspies27@gmail.com.
• Arch Orthop Trauma Surg. 2021 Jun 1; 141 (6): 1073-1080.

IntroductionBiomechanical evaluation of the viscoelastic properties tissue deformation, stiffness, and maximum breaking load of the human A2 pulley. We hypothesized that the A2 pulleys of index, middle, and ring fingers exhibit no difference regarding the aforementioned biomechanical parameters.MethodsForty-one A2 pulleys of 14 upper extremities (8 body donors) were assessed. Cyclic and load-to-failure testing were performed. The biomechanical parameters tissue deformation during cyclic and load-to-failure testing, stiffness, and maximum breaking load were determined.ResultsNo significant differences between the fingers could be detected regarding the biomechanical parameters. A significant negative correlation could be detected between stiffness and deformation of the pulley. Significant positive correlations could be identified between stiffness and maximum breaking load and between maximum breaking load and deformation of the pulleys.ConclusionsAssessment of the viscoelastic properties of the A2 finger pulley promotes precise diagnosis of pulley lesions and will help to optimize treatment.

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