A suture anchor suitable for being fixed in a hard tissue opening with the aid of a material having thermoplastic properties and energy transmitted to the suture anchor for in situ liquefaction of at least part of the material having thermoplastic properties comprises an anchor foot (22) and a thermoplastic sleeve (23). The anchor foot (22) comprises a system (25) of channels and/or grooves with a mouth in a proximal face of the anchor foot (22), the system (25) being suitable for threading a suture (4) in form of a loop therethrough and the thermoplastic sleeve (23) is arranged or arrangeable coaxially to said mouth. The thermoplastic sleeve comprises the material having thermoplastic properties and is arranged or arrangable at a proximal face of the anchor foot (22). Furthermore, the anchor comprises a locking element (35) capable of securing the suture in a non-slideable manner relative to the hard tissue or the anchor comprises a securing sleeve (36) capable of securing the suture (4) from being damaged by the hard tissue edge around a mouth of the hard tissue opening. The locking element (35) or the securing element (36) is equipped to be secured relative to the anchor foot (22) when the anchor foot is in a fixed state.
