The influence of concentric and eccentric loading on the finger pulley system |
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| Authors: | I Schöffl K Oppelt J Jüngert A Schweizer T Bayer W Neuhuber V Schöffl |
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| Institution: | 1. Institute of Anatomy 1, Friedrich-Alexander University Erlangen-Nuremberg, FRG;2. Department of Trauma Surgery, Friedrich-Alexander University Erlangen-Nuremberg, FRG;3. Department of Pediatrics, Friedrich-Alexander University Erlangen-Nuremberg, FRG;4. Department of Orthopaedics, Balgrist, University of Zurich, Switzerland;5. Department of Orthopaedic and Trauma Surgery, Klinikum Bamberg, FRG;1. Department of Sports Medicine–Sports Orthopedics, Klinikum Bamberg, Bamberg, Germany (Drs V. Schöffl and Popp);2. Department of Trauma Surgery, Friedrich Alexander University Erlangen-Nuremberg, Erlangen, Germany (Dr V Schöffl);3. Institute of Occupational and Social Medicine, RWTH Aachen Technical University, Aachen, Germany (Dr Küpper);4. Department of Pediatrics, Klinikum Bamberg, Bamberg, Germany (Dr I Schöffl);1. Department of Pediatrics and Adolescent Medicine, Klinikum Bamberg, Bamberg, Germany;2. Institute of Anatomy, University Erlangen, Erlangen, Germany;3. IDEWE, Zwijnaarde, Belgium;4. Institute of Sports Medicine Bamberg, Klinikum Bamberg, Bamberg, Germany;5. Department of Pediatrics and Adolescent Medicine, University Hospital of Erlangen-Nuremberg, Erlangen, Germany;1. Department of Orthopaedic Surgery, Stanford University, 300 Pasteur Drive, Room R144, Mail Code: 5341, Stanford, CA 94305, USA;2. Department of Orthopaedic Surgery, Stanford University, Stanford, CA, USA;1. Department of Orthopaedic Surgery, University of Cincinnati, TriHealth Hospital System, 538 Oak Street, Suite 200, Cincinnati, OH 45219, USA;2. Section of Plastic Surgery, Department of Orthopaedic Surgery, University of Michigan, 2098 South Main Street, Ann Arbor, MI 48103, USA |
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| Abstract: | In this study we investigated the influence of the loading condition (concentric vs. eccentric loading) on the pulley system of the finger. For this purpose 39 cadaver finger (14 hands, 10 donors) were fixed into an isokinetic loading device. The forces in the flexor tendons and at the fingertip were recorded. In the concentric loading condition A2 and A4 ruptures as well as alternative events such as fracture of a phalanx or avulsion of the flexor tendons were almost equally distributed, whereas the A2 pulley rupture was the most common event (59%) in the eccentric loading condition and alternative events were rare (23.5%). The forces in the deep flexor tendon, the fingertip and in the pulleys were significantly lower in the eccentric loading condition. As the ruptures occurred at lower loads in the eccentric than in the concentric loading condition it can be concluded that friction may be an advantage for climbers, supporting the holding force of their flexor muscles but may also increase the susceptibility to injury. |
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