A knotless suture anchor may include an anchor body with a proximal end, a distal end, an interior longitudinal passageway, a proximal opening communicating with the longitudinal passageway nearer the proximal end, and a distal opening communicating with the longitudinal passageway nearer the distal end. A first suture portion extends within the longitudinal passageway between the proximal opening and the distal opening, a second suture portion is contiguous to the first portion and extending out of the anchor body, a third suture portion is contiguous to the second portion and extends within the longitudinal passageway proximally to distally, and a fourth suture portion is contiguous to the third portion, extending along the exterior surface distally to proximally. A proximal member may be joined to the anchor body by a frangible connection and may have a proximal member axial passage containing an interference member coaxially aligned with the longitudinal passageway.