Chronic pain is relatively common after different types of surgery. The investigators intend to study prevalence, characteristics and risk factors of chronic pain after shoulder arthroplasty, focusing on neuropathic pain characteristics, and risk factors such as preoperative pain, severe acute postoperative pain, age, gender, and pain elsewhere.

Inclusion Criteria:

• Patients operated with any shoulder prosthesis between april 2011 and april 2012 in Denmark

Exclusion Criteria:

• Secondary prosthesis
• Bilateral prosthesis
• Age below 18
• Reoperated in the same shoulder after the prosthesis

Patients in the Danish Shoulder Arthroplasty Register