An orthopedic trial component configured to provisionally replace a portion of a bone of a joint, the orthopedic trial component comprising: a body portion comprising: an outward-facing side defining an articular surface for the joint; an inward- facing side defining a bone-facing surface configured to abut a resection surface of the bone; a slide channel formed in the inner side of the body portion, wherein the slide channel extends along a slide axis, and is defined in part by an opening in the bone-facing surface; and at least one drill guide extending from the articular surface to the bone-facing surface in a predetermined orientation relative to the body portion; a fastening mechanism slidably mounted to the body portion for movement along the slide axis, the fastening mechanism comprising a slider body and a bone-engaging post extending from the slider body, wherein the slider body is at least partially received in the slide channel, and wherein the bone-engaging post projects inwardly beyond the bone-facing surface; and a selective coupling mechanism , wherein the fastening mechanism is engaged with the body portion via the selective coupling mechanism, and wherein the selective coupling mechanism is configured to selectively prevent movement of the fastening mechanism along the slide axis, characterised in that the selective coupling mechanism is configured to permit movement of the body portion when a force along the slide axis exceeds a threshold force value, and to prevent movement of the body portion when the force along the slide axis does not exceed the threshold force value. a body portion comprising: an outward-facing side defining an articular surface for the joint; an inward- facing side defining a bone-facing surface configured to abut a resection surface of the bone; a slide channel formed in the inner side of the body portion, wherein the slide channel extends along a slide axis, and is defined in part by an opening in the bone-facing surface; and at least one drill guide extending from the articular surface to the bone-facing surface in a predetermined orientation relative to the body portion; an outward-facing side defining an articular surface for the joint; an inward- facing side defining a bone-facing surface configured to abut a resection surface of the bone; a slide channel formed in the inner side of the body portion, wherein the slide channel extends along a slide axis, and is defined in part by an opening in the bone-facing surface; and at least one drill guide extending from the articular surface to the bone-facing surface in a predetermined orientation relative to the body portion; a fastening mechanism slidably mounted to the body portion for movement along the slide axis, the fastening mechanism comprising a slider body and a bone-engaging post extending from the slider body, wherein the slider body is at least partially received in the slide channel, and wherein the bone-engaging post projects inwardly beyond the bone-facing surface; and a selective coupling mechanism , wherein the fastening mechanism is engaged with the body portion via the selective coupling mechanism, and wherein the selective coupling mechanism is configured to selectively prevent movement of the fastening mechanism along the slide axis, characterised in that the selective coupling mechanism is configured to permit movement of the body portion when a force along the slide axis exceeds a threshold force value, and to prevent movement of the body portion when the force along the slide axis does not exceed the threshold force value. <EOS>