1. An anchor assembly comprising: an anchor body; an anchor head including a first arm and a second arm extending substantially parallel to one another and away from the anchor body, the first arm and the second arm separated by a gap; a shaft connected to the first arm and the second arm across the gap; a saddle having a longitudinal bore, a transverse bore which intersects the longitudinal bore, and a member capture opening adapted to receive a member wherein the member capture opening intersects the longitudinal bore; said transverse bore of said saddle being mounted about said shaft such that the saddle can move relative to the anchor head; a set screw received in said longitudinal bore of said saddle and adapted to lock the member in said member capture opening of said saddle; and said saddle including reinforced walls that prevent said saddle splaying when said set screw locks the member in said member capture opening of said saddle.
2. The anchor assembly of claim 1 wherein said member capture opening is U-shaped with ridges located about said member capture opening so as to prevent splaying of said saddle.