The goal of this prospective observational cohort study is to provide epidemiological and prognostic data from a defined urban population and to improve understanding of risk factors and long-term outcomes following first-time anterior shoulder dislocation in patients aged 16 years and older presenting to the Oslo Accident and Emergency Outpatient Clinic.
The main questions the study aims to answer are:
* What is the incidence of first-time anterior shoulder dislocations in the Oslo region?
* What is the prevalence and extent of bipolar bone loss and soft tissue injuries measured by CT and MR after a first-time shoulder dislocation?
* Does bone loss increase the risk of recurrent shoulder instability?
* How do imaging findings and recurrence influence long-term shoulder function and quality of life?
Participants will:
* Undergo standard clinical evaluation and conventional radiographs as part of routine care and asked to participate and followed longitudinally
* Be offered additional CT and MRI imaging to assess glenoid and humeral bone loss and to evaluate soft tissue injuries.
* Complete electronic questionnaires (WOSI, EQ-5D-5L, pain score, Rowe score, return to sport/work) at 3 months, 1 year, 5 years, and 10 years.
* Be invited to long-term follow-up, including radiographs at 10 years to evaluate signs of osteoarthritis.