The optimal timing for surgical repair of traumatic rotator cuff tears is controversial. Today there are no prospective studies investigating the short to mid-term outcome after early arthroscopic repair of traumatic rotator cuff tears and the Swedish National Musculoskeletal Competence Centre requests more research to this subject. The investigators will follow 60 patients with acute rotator cuff tear undergoing early rotator cuff repair during the first year after surgery.

The investigators hypothesise that the outcome after rotator cuff repair is good.

There exists controversy in the current literature regarding timing for surgical repair of traumatic rotator cuff tears. We have seen no prospective studies describing the progression of shoulder function improvement the first year after arthroscopic rotator cuff repair.

We hypothesize that early arthroscopic repair of traumatic rotator cuff tears yields successful functional and structural outcomes but there will be a progression of shoulder function improvement during the hole first postoperative year.

Inclusion Criteria:

• trauma to the shoulder with sudden onset of symptoms
• asymptomatic shoulder before trauma
• mr positive for full thickness rotator cuff tear

Exclusion Criteria:

• fracture
• severe comorbidity
• more than 6 weeks after trauma
• glenohumeral degeneration signs or osteoarthritis on x-ray

A prospective trial analysing the results after early arthroscopic repair of the traumatic rotator cuff tear. Every consecutive patient between Nov 2010 and Oct 2013 who fulfill the inclusion criteria are asked to participate after oral and written information. With a population of 250.000 we approximate an enrollment of 60 participants.