• Arch Orthop Trauma Surg · Jan 2000

    Mechanical properties of a rat patellar tendon stress-shielded in situ.

    • T Müllner, O Kwasny, R Reihsner, V Löhnert, and R Schabus.
    • University Clinic of Traumatology, University of Vienna Medical School, Austria. tmuellner@csi.com
    • Arch Orthop Trauma Surg. 2000 Jan 1; 120 (1-2): 70-4.

    AbstractThe effects of stress deprivation on the mechanical properties of the patellar tendon (PT) were studied using 14 albino rats. The PT was stress-shielded with cerclages on one side, while the contralateral patellar tendon served as a sham-operated control. After 10 weeks, paired load-strain as well as load-relaxation experiments were performed (11 and 3 specimen pairs, respectively). Mechanical tests showed, irrespective of the cerclage material used, that strain was increased significantly after stress-shielding (P < 0.02). The time constant significantly decreased in the stress-shielded specimens under 5 N loads, which may be considered 'physiological'. Tissue remodeling might explain the observed changes in the viscoelastic behaviour of the stress-shielded tendons. Loading, even in the physiological range of normal daily activity, may lead to an elongation of previously stress-shielded tendons or ligaments and consequently alter the behaviour of a joint.

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