(a) providing a suture anchor comprising, a locking body comprising a central anchoring post, an eyelet configured to receive one or more suture threads, and at least one protuberance for securing said central anchoring post in bone; and a collar movably engaged with said central anchoring post, said collar having a hole therethrough for receiving said central anchoring post and having an exterior surface comprising at least one protuberance for securing said collar in bone, wherein said collar is configured to lock one or more suture threads between said collar and said locking body;

(b) attaching suture thread to said tissue;

(c) positioning the ends of said suture thread through said eyelet, with said collar located distally to said eyelet;

(d) inserting said suture anchor into a pre-drilled hole in said bone while keeping said collar positioned distally to said eyelet;

(e) positioning said tissue by applying force to said ends of said suture thread; and

(f) further inserting said locking body into said hole in said bone so that said collar is located proximally to said eyelet, with said suture thread locked between said collar and said central anchoring post.