Abstract
Composite structures are designed to mimic the morphology and mechanical properties of natural ligaments. Filament winding technology has been implemented in order to obtain a composite material based on a polyurethane matrix (HydroThane™), reinforced with degradable and non-degradable fibers. The mechanical properties of the matrix and fiber have been analysed to define the optimal type, volume ratio and winding angle of the reinforcement. The typical J-shaped stress-strain curve, displayed by natural tendons and ligaments, is reproduced. The mechanical behaviour of HydroThane™ reinforced with poly(ethylene terephthalate) (PET) fibers were modified by varying the winding angle of the fibers.
Fibers comprising poly(l-lactic acid) (PLLA), poly(glycolic acid) (PGA) and PET, individually and in combination, were considered as candidate materials for the reinforcement of a composite ligament augmentation device (LAD). Mechanical and degradation studies demonstrated that, by combining different types of fiber, at a fixed volume fraction and winding angle (20°), it is possible to optimize mechanical properties and degradation kinetics of the device.