In order to make the measurement of pain more robust, a valid and reliable tool should be used. The Numeric Rating Scale (NRS) & Brief Pain Inventory will be used. The Brief Pain Inventory (BPI) is a widely used tool that has been validated in a wide variety of clinical and research populations, including the cancer population (42) and post operative population (43). It takes about 5 minutes to complete. The BPI measures pain intensity and pain interference on work, activity, mood, enjoyment sleep, walking, and relationships. It is important to assess baseline pain when undertaking a trial to assess pain or analgesia related outcomes.