A composite implant comprising an injectable matrix material which is flowable and settable, and at least one reinforcing element for integration with the injectable matrix material, the at least one reinforcing element adding sufficient strength to the injectable matrix material such that when the composite implant is disposed in a cavity in a bone, the composite implant supports the bone. A method for treating a bone comprising: selecting at least one reinforcing element to be combined with an injectable matrix material to form a composite implant capable of supporting the bone; positioning the at least one reinforcing element in a cavity in the bone; flowing the injectable matrix material into the cavity wherein the injectable matrix material interfaces with the at least one reinforcing element; and transforming the injectable matrix material from a flowable state to a nonflowable state to establish a static structure that supports the adjacent bone.