A method for performing an orthopaedic surgical procedure on a knee joint of a patient includes resecting a proximal end of a patient’s tibia to create a resected surface of the patient’s tibia and positioning a tibial paddle of a sensor module on the proximal end of the patient’s tibia. For example, the pyrimidine derivatives of the invention may be used to treat, ameliorate or prevent a condition which responds to inhibition of insulin-like growth factor or analplastic lymphoma kinase. The pockets enable the reusable items to be stored therein and then the indicating flag is then moved out of the pocket so that it is exposed over the cartridge, so that the user knows that the reusable item has already been used and has no additional storage capacity or knows not to reuse it to record over it unless they intend to do so. The magnitude of the current pulse is a function of a predicted increase in current demand during that clock cycle, and of the magnitude of an adaption signal controlled by a feedback circuit provided to limit variation in voltage developed at the DUT’s power input terminal. In some embodiments, the speaker housings are configured to constrain the housings to a specific orientation when mated. The phase change-type memory element comprises: two or more electrodes provided opposite to each other through an insulating layer; an exposed surface on which at least a part of the insulating layer and at least a part of each of the electrodes are exposed; and a phase change recording material layer provided, on the exposed surface, in contact with the at least two electrodes.