Open and arthroscopic Latarjet procedures are used to treat shoulder instability as primary and salvage procedures. During surgery the coracoid process is detached and repositioned to the anterior glenoid through a subscapularis split and fixed in place, resulting in an enlarged glenoid and therefor articular surface. However, before this is done, the pectorals minor, which inserts at the coracoid process, has to be detached and is left without further treatment. Moreover, the conjoint tendon, the origin of the short head of the biceps and coracobrachialis, is repositioned with the coracoid and therefor distalized and medialized.

No study currently followed up on the strength of the muscles altered. The aim of this study is therefor, to prospectively measure range of motion and strength of the operated shoulder at different time points pre- and postoperatively, comparing it with the healthy shoulder in each individual.

Strength, range of motion and stability will be assessed pre-operatively and at 6 weeks, 12 weeks, 6 months, 12 months and 24 months post-operatively. Next to standard radiological follow up, including X-ray, arthrographic computed tomography as well as arthrographic magnetic resonance imaging, specific shoulder scores will be utilised. Strength for general shoulder motion as well as specifically for the subscapularis, the pectorals minor, the coracobrachialis and the biceps will be measured with a shoulder dynamometer. Data will be analysed and published.

Inclusion Criteria:

• Patients who experienced at least one shoulder dislocation.
• Patients who are willing to participate in the study
• Patients who receive arthroscopic Latarjet procedure for treatment of glen-humeral instability
• Patients who are at least 18 years old.
• Patients with an ISI-Score of at least 4 points.

Exclusion Criteria:

• Patients older than 50 or younger than 18 years of age.
• Patients with painful unstable (multidirectional) instability
• Patients with congenital defects of the bones involved (humerus, scapula).
• Patients with an ISIS of smaller 4 points.

Patients with shoulder instability or shoulder dislocations, treated with arthroscopic Latarjet at the Etzelclinic will be enrolled in consideration of the inclusion and exclusion criteria.

To discuss and evaluate results as well as drafting the manuscript, IPD might be shared with other researchers.

As soon as data of each patient involved is collected, it will possibly be shared with participating researchers and experienced advisors, until final manuscript is drafted.

Personal (eye to eye)