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Bone structural properties as determined by torsion test. UHMWPE particles with or without IL-4 or 7ND releasing implant surface coating were infused into murine distal femurs through a hollow titanium rod. After 4 weeks the rod was removed with pullout test and the structural properties of the surrounding bone determined by torsion test. Normalized values of maximum torque before failure and torsional rigidity were determined. *p <0.05.
