An orthopaedic prosthetic assembly , comprising: a femoral component configured to be attached to a distal end of a patient's femur, the femoral component including (i) a pair of condyles , (ii) an intercondylar notch defined between the condyles, and (iii) a posterior bore extending in a medial-lateral direction through the pair of condyles, a tibial tray configured to be attached to a proximal end of a patient's tibia, the tibial tray including a platform and a post (extending distally from the platform, a tibial insert including (i) a body having a pair of surfaces configured to engage corresponding condyle surfaces of the condyles of the femoral component, (ii) a stem extending distally from the body and sized to be received in a cavity defined in the tibial tray, (iii) a spine extending proximally from the body, and (iv) a pin hole extending through the spine of the tibial insert, and a hinge pin , wherein the spine includes a medial opening , a lateral opening , and an inner wall extending between the medial and the lateral openings to define the pin hole, characterised by a pair of bushings sized and shaped to be positioned in the pin hole of the spine, wherein the hinge pin is sized and shaped to be positioned in the pair of bushings and the posterior bore to couple the tibial insert to the femoral component, and wherein each bushing has an annular flange , and an elongated body extending from the annular flange, the elongated body including a retaining tab , the retaining tab of a first bushing being sized and shaped to secure to the retaining tab of a second bushing to secure the pair of bushings to the spine. a femoral component configured to be attached to a distal end of a patient's femur, the femoral component including (i) a pair of condyles , (ii) an intercondylar notch defined between the condyles, and (iii) a posterior bore extending in a medial-lateral direction through the pair of condyles, a tibial tray configured to be attached to a proximal end of a patient's tibia, the tibial tray including a platform and a post (extending distally from the platform, a tibial insert including (i) a body having a pair of surfaces configured to engage corresponding condyle surfaces of the condyles of the femoral component, (ii) a stem extending distally from the body and sized to be received in a cavity defined in the tibial tray, (iii) a spine extending proximally from the body, and (iv) a pin hole extending through the spine of the tibial insert, and a hinge pin , wherein the spine includes a medial opening , a lateral opening , and an inner wall extending between the medial and the lateral openings to define the pin hole, characterised by a pair of bushings sized and shaped to be positioned in the pin hole of the spine, wherein the hinge pin is sized and shaped to be positioned in the pair of bushings and the posterior bore to couple the tibial insert to the femoral component, and wherein each bushing has an annular flange , and an elongated body extending from the annular flange, the elongated body including a retaining tab , the retaining tab of a first bushing being sized and shaped to secure to the retaining tab of a second bushing to secure the pair of bushings to the spine. <EOS>