A knee prosthesis system comprising: a femoral component having a medial and lateral condyle portion connected by a patellar track portion and femoral box, the femoral box defining a first pair of passages therethrough; a tibial component having a platform portion and an inferiorly extending stem; a first femoral component insert having a first pair of closed walls, the first femoral component insert sized to selectively locate at the femoral box; a second femoral component insert having a second pair of walls that define a second pair of passages therethrough, the second femoral component insert sized to selectively locate at the femoral box wherein the first and second pair of passages cooperatively align for receipt of an axle; and a first tibial bearing having first bearing surfaces configured to engage the medial and lateral condyle portions; characterised in that the knee prosthesis further comprises a second tibial bearing having second bearing surfaces configured to engage the medial and lateral condyle portions, the second tibial bearing further comprising a superiorly extending portion defining an axle passage; wherein the knee prosthesis system is configured in one of a first non-hinged configuration and a second hinged configuration, wherein in the first non-hinged configuration the first femoral component insert is positioned at the femoral box of the femoral component and the first tibial bearing is positioned onto the tibial component, wherein in the second hinged configuration the second femoral component insert is positioned at the femoral box and the axle is located through the first and second passages and the second tibial bearing is positioned onto the tibial component. a femoral component having a medial and lateral condyle portion connected by a patellar track portion and femoral box, the femoral box defining a first pair of passages therethrough; a tibial component having a platform portion and an inferiorly extending stem; a first femoral component insert having a first pair of closed walls, the first femoral component insert sized to selectively locate at the femoral box; a second femoral component insert having a second pair of walls that define a second pair of passages therethrough, the second femoral component insert sized to selectively locate at the femoral box wherein the first and second pair of passages cooperatively align for receipt of an axle; and a first tibial bearing having first bearing surfaces configured to engage the medial and lateral condyle portions; characterised in that the knee prosthesis further comprises a second tibial bearing having second bearing surfaces configured to engage the medial and lateral condyle portions, the second tibial bearing further comprising a superiorly extending portion defining an axle passage; wherein the knee prosthesis system is configured in one of a first non-hinged configuration and a second hinged configuration, wherein in the first non-hinged configuration the first femoral component insert is positioned at the femoral box of the femoral component and the first tibial bearing is positioned onto the tibial component, wherein in the second hinged configuration the second femoral component insert is positioned at the femoral box and the axle is located through the first and second passages and the second tibial bearing is positioned onto the tibial component.