Suture anchor with enhanced fixation

A method of attaching tissue to a bone comprising the step of:

• passing a first portion of a suture length through the tissue;
• embedding into the bone a suture anchor, the suture anchor comprising an anchor body comprising an anchor body having a proximal end, a distal end, a longitudinal axis and bone engaging external threads oriented for rotation about the longitudinal axis, a longitudinal axial bore extending into the body from its proximal end, at least one lateral passage passing from the axial bore outwardly through the body;
• and a suture attachment element disposed within the axial bore having at least one protruding member having a first position disposed within the axial bore and a second position protruding outwardly from the anchor body through the at least one lateral passage, the step of embedding being performed while the suture attachment is in the first position;
• and
• moving the suture attachment into the second position such that the at least one protruding member extends beyond the suture anchor body into the bone to resist rotation of the suture anchor body within the bone.