A readily implantable knotless suture anchor that de-couples the angle of insertion of the anchor from the tissue passage step and other steps of conventional procedures. An anchor provides an internal locking mechanism configured such that: suture knots do not have to be tied； suture and tissue tension can be easily adjusted intraoperatively； and suture passage and tensioning can be done at a variety of positions and angles. A method includes: passing a first suture through a patient's tissue and then through a loop of a shuttle suture； pulling the free end of the shuttle suture until the first suture passes through an internal suture locking mechanism； applying tension in the first suture until adequate tension is achieved with respect to the tissue； automatically engaging an internal locking member； and securing the first suture against further relative movement with respect to the anchor.
