Postoperative surgical pain has been extensively study with regard to anaesthesia pain modalities, however little is published with regards to various arthroscopic shoulder surgical techniques. An intriguing characteristic of shoulder arthroscopy is the various arthroscopic pump pressures used by different surgeons. One could hypothesize that excessive water retention from the arthroscopic pump could causes excessive tissue pressure and swelling resulting in post operative pain. Unfortunately we could not find any literature in the English language regarding varying pressure pump settings on post operative pain control. For that reason we would like to assess how variable pump pressure effect tissue pressure over pre set time points, and how this may relate to post operative pain control.

Inclusion Criteria:

• Patients attending St. Joseph's hospital
• Shoulder pathology amenable to arthroscopic surgery
• Medically suitable for surgical management
• Able to consent for surgery.

Exclusion Criteria:

• Unable to consent
• Active infection
• Active malignancy
• Drug or alcohol misuse
• Work related injury
• Lack of permanent home residence
• Previous surgery to affected shoulder
• Medical contraindiction to surgery
• Pregnant women