A signal to interference-plus-noise power ratio measurement method for wireless communications systems which employ orthogonal frequency division multiplexing for multicarrier data transmission is disclosed. A cannulated hinge post is rotatably connected to the femoral component of the knee prosthesis so that a hinge post extension may be anteriorly positioned through the hinge post and into the tibial component of the knee prosthesis, after positioning of the femoral component in the femur and the tibial component in the tibia. The first interface includes inputs to sample at least two bits of the address information in succession during a clock cycle of the first clock signal.