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  • Title: Physiological functions of the human finger.
    Author: Dumont C, Burfeind H, Kubein-Meesenburg D, Hosten N, Fanghanel J, Gredes T, Nagerl H.
    Journal: J Physiol Pharmacol; 2008 Nov; 59 Suppl 5():69-74. PubMed ID: 19075326.
    Abstract:
    Using morphological data describing the physiological curvature morphology of the corresponding articulating surfaces in each finger joint, it is shown that a) the flexion of each finger joint is described by two angles of flexion; b) in each finger joint, a "pump mechanism" for synovial fluid is present whose function is to lubricate and nourish the joint cartilage and c) finger posture has six kinematic degrees of freedom (DOF). Since six muscle forces control finger posture, the relationship between the muscle forces and finger posture is unambiguously described. The states of flexion of the interphalangeal joints restrict possible flexions in the metacarpophalangeal joint. Since the muscle forces act simultaneously on all three finger joints, the interdependence of the flexional states in the three finger joints can be attributed to the alignment of the lines of force and their sites of insertion, as a function of the corresponding flexion in the joints.
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