An implantable bone anchor assembly comprises an outer anchor tube and a tubular insert. The outer anchor tube defines a longitudinal axis of the bone anchor assembly and a longitudinal channel. The outer anchor tube has a first portion including a first end, and a plurality of fingers circumferentially spaced from one another about the longitudinal axis. Each of the fingers extends from the first portion and has a free end, wherein the fingers are configured to project laterally at an oblique angle relative to the longitudinal axis, and are further configured to be deflectable radially inward to allow the anchor tube to be disposed within a tubular cannula for deployment. The tubular insert has a head having an opening therein, a shank extending from the head having an open end, and a longitudinal bore extending from the opening in the head to the open end of the shank. The longitudinal bore is configured to receive a portion of a suture assembly for an orthopedic treatment. The shank is sized to be received in the longitudinal channel, and the outer anchor tube and the tubular insert are configured to be locked together upon complete insertion of the shank into the longitudinal channel.
