A prosthetic glenoid implant for replacing a native glenoid, the prosthetic glenoid implant comprising: a bearing component having a first articulating surface adapted to articulate with a native or prosthetic humeral head, and a second surface opposite the first surface, the bearing component being formed of a polymer, the second surface including a first mating feature; a base component (300, 300', 300", 300′′′) having a first surface and a bone-contacting surface, the first surface of the base component having a second mating feature adapted to engage the first mating feature in an assembled condition of the prosthetic glenoid implant, the bone-contacting surface adapted to contact the native glenoid, the base component being formed of metal and defining a plurality of apertures extending from the first surface of the base component to the bone-contacting surface of the base component, the base component including a keel extending away from the bone-contacting surface, the keel being generally trapezoidal such that it has a length in a length direction extending away from the bone-contacting surface, and a width in a width direction transverse the length direction, the width being smaller than the length; and a plurality of fixation members each having a head and a threaded shaft, the threaded shaft of each fixation member adapted to pass through a corresponding one of the plurality of apertures, the head of each fixation member adapted to be positioned within a recess defined between the base component and the bearing component in an assembled condition of the prosthetic glenoid implant; characterised in that the base component includes a base portion provided with superior and inferior extensions, which each includes an aperture, said apertures in the superior and inferior extensions forming superior and inferior apertures for superior and inferior fixation member to extend therethrough, so that the superior and inferior extensions and fixation members are respectively positioned superior and inferior to the keel along a height direction transverse to the length and width directions. a bearing component having a first articulating surface adapted to articulate with a native or prosthetic humeral head, and a second surface opposite the first surface, the bearing component being formed of a polymer, the second surface including a first mating feature; a base component (300, 300', 300", 300′′′) having a first surface and a bone-contacting surface, the first surface of the base component having a second mating feature adapted to engage the first mating feature in an assembled condition of the prosthetic glenoid implant, the bone-contacting surface adapted to contact the native glenoid, the base component being formed of metal and defining a plurality of apertures extending from the first surface of the base component to the bone-contacting surface of the base component, the base component including a keel extending away from the bone-contacting surface, the keel being generally trapezoidal such that it has a length in a length direction extending away from the bone-contacting surface, and a width in a width direction transverse the length direction, the width being smaller than the length; and a plurality of fixation members each having a head and a threaded shaft, the threaded shaft of each fixation member adapted to pass through a corresponding one of the plurality of apertures, the head of each fixation member adapted to be positioned within a recess defined between the base component and the bearing component in an assembled condition of the prosthetic glenoid implant; characterised in that the base component includes a base portion provided with superior and inferior extensions, which each includes an aperture, said apertures in the superior and inferior extensions forming superior and inferior apertures for superior and inferior fixation member to extend therethrough, so that the superior and inferior extensions and fixation members are respectively positioned superior and inferior to the keel along a height direction transverse to the length and width directions.