An implantable medical device, comprising: a thermoplastic composite body including: an anterior surface of the thermoplastic composite body; a first lateral surface of the thermoplastic composite body; a second lateral surface of the thermoplastic composite body; a posterior surface of the thermoplastic composite body; a superior surface of the thermoplastic composite body; an inferior surface of the thermoplastic composite body; at least one dense portion formed of a first thermoplastic polymer matrix that is essentially non-porous, and which is continuous through a thickness dimension from the superior surface of the thermoplastic composite body to the inferior surface of the thermoplastic composite body; and at least one porous portion formed of a porous thermoplastic polymer scaffold, the porous thermoplastic polymer scaffold being formed of a second thermoplastic polymer matrix, the at least one porous portion being continuous through the thickness dimension from the superior surface of the thermoplastic composite body to the inferior surface of the thermoplastic composite body, wherein the at least one dense portion and the at least one porous portion are integrally formed such that the thermoplastic composite body is a single continuous article free of adhesive and mechanical joints between the at least one dense portion and the at least one porous portion. a thermoplastic composite body including: an anterior surface of the thermoplastic composite body; a first lateral surface of the thermoplastic composite body; a second lateral surface of the thermoplastic composite body; a posterior surface of the thermoplastic composite body; a superior surface of the thermoplastic composite body; an inferior surface of the thermoplastic composite body; at least one dense portion formed of a first thermoplastic polymer matrix that is essentially non-porous, and which is continuous through a thickness dimension from the superior surface of the thermoplastic composite body to the inferior surface of the thermoplastic composite body; and at least one porous portion formed of a porous thermoplastic polymer scaffold, the porous thermoplastic polymer scaffold being formed of a second thermoplastic polymer matrix, the at least one porous portion being continuous through the thickness dimension from the superior surface of the thermoplastic composite body to the inferior surface of the thermoplastic composite body, wherein the at least one dense portion and the at least one porous portion are integrally formed such that the thermoplastic composite body is a single continuous article free of adhesive and mechanical joints between the at least one dense portion and the at least one porous portion. an anterior surface of the thermoplastic composite body; a first lateral surface of the thermoplastic composite body; a second lateral surface of the thermoplastic composite body; a posterior surface of the thermoplastic composite body; a superior surface of the thermoplastic composite body; an inferior surface of the thermoplastic composite body; at least one dense portion formed of a first thermoplastic polymer matrix that is essentially non-porous, and which is continuous through a thickness dimension from the superior surface of the thermoplastic composite body to the inferior surface of the thermoplastic composite body; and at least one porous portion formed of a porous thermoplastic polymer scaffold, the porous thermoplastic polymer scaffold being formed of a second thermoplastic polymer matrix, the at least one porous portion being continuous through the thickness dimension from the superior surface of the thermoplastic composite body to the inferior surface of the thermoplastic composite body, wherein the at least one dense portion and the at least one porous portion are integrally formed such that the thermoplastic composite body is a single continuous article free of adhesive and mechanical joints between the at least one dense portion and the at least one porous portion.