The Effect of an Axillary Roll During Total Hip Replacement Performed in the Lateral Decubitus Position on Post-operative Shoulder and Neck Pain (The Axillary Trial).

INTERVENTION: Participants will be placed into the lateral position post induction of anaesthesia. A Standard foam axillary roll is placed under the patient's dependent thorax at the location of the inferior tip of the scapula. A head pillow is to be used in all cases. The axillary roll is to be present for the duration of the surgery and removed at the cessation of anaesthesia. The approximate duration of surgery is 60 minutes. CONDITION: Post‐operative shoulder and neck pain PRIMARY OUTCOME: To determine if there is a relationship between the use of an axillary roll during surgery in the lateral decubitus position and the presence or absence of post‐operative shoulder and neck pain. In the immediate post‐operative phase and on Day One after their operation, participants will be asked what their level of shoulder and neck pain is according to the visual analogue pain scale (VAS). SECONDARY OUTCOME: Patients will be asked if they have any tingling or numbness in their hand on the opposite side to their operation (subjective). If the answer is in the affirmative, they will be referred back to their Anaesthetist for follow up, such as nerve studies (objective). INCLUSION CRITERIA: INCLUSION CRITERIA: 1. Patients who will undergo elective total hip replacement surgery at selected sites. 2. Patients over the age of 18 3. Patients in whom informed written consent has been obtained.