An elongate member reinforcement system and associated methods are disclosed. The system can include an elongate member, a collar secured about an end portion of the elongate member, a support layer surrounding the end portion of the elongate member, and a structural filler disposed between the support layer and the end portion of the elongate member. The collar can be disposed in the structural filler and can include a structural filler interface feature that mechanically couples the collar to the structural filler to facilitate transferring loads between the elongate member and the structural filler.