An orthopedic hip prosthesis comprising: a prosthetic femoral neck sized and configured to be fixedly connected to a femur of a patient, the prosthetic femoral neck comprising a cylindrical axle extending from a proximal end and a femoral shank extending from a distal end, the axle defining an outer circumferential surface; a prosthetic femoral head sized and configured to be received by an acetabulum of the patient and rotationally connected to the prosthetic femoral neck, the prosthetic femoral head being substantially spherical and comprising a cylindrical recess defining an inner circumferential surface, wherein the axle of the prosthetic femoral neck is rotationally engaged within the recess of the prosthetic femoral head; and a plurality of roller bearings proximally positioned between the outer circumferential surface of the axle and the inner circumferential surface of the recess, the plurality of roller bearings disposed to support rotational movement between the prosthetic femoral head and the prosthetic femoral neck; characterised by a plurality of ball bearings distally positioned between the outer circumferential surface of the axle and the inner circumferential surface of the recess, the plurality of ball bearings disposed to restrict translational movement of the prosthetic femoral neck relative to the prosthetic femoral head, the plurality of ball bearings retained inside an annular retention channel , wherein said prosthetic femoral head and said prosthetic femoral neck are configured to accommodate coaxial motion of the hip joint; and a lubricant reservoir disposed within the axle. a prosthetic femoral neck sized and configured to be fixedly connected to a femur of a patient, the prosthetic femoral neck comprising a cylindrical axle extending from a proximal end and a femoral shank extending from a distal end, the axle defining an outer circumferential surface; a prosthetic femoral head sized and configured to be received by an acetabulum of the patient and rotationally connected to the prosthetic femoral neck, the prosthetic femoral head being substantially spherical and comprising a cylindrical recess defining an inner circumferential surface, wherein the axle of the prosthetic femoral neck is rotationally engaged within the recess of the prosthetic femoral head; and a plurality of roller bearings proximally positioned between the outer circumferential surface of the axle and the inner circumferential surface of the recess, the plurality of roller bearings disposed to support rotational movement between the prosthetic femoral head and the prosthetic femoral neck; characterised by a plurality of ball bearings distally positioned between the outer circumferential surface of the axle and the inner circumferential surface of the recess, the plurality of ball bearings disposed to restrict translational movement of the prosthetic femoral neck relative to the prosthetic femoral head, the plurality of ball bearings retained inside an annular retention channel , wherein said prosthetic femoral head and said prosthetic femoral neck are configured to accommodate coaxial motion of the hip joint; and a lubricant reservoir disposed within the axle. <EOS>