Abstract
<h2>Abstract</h2><h3>Background</h3> While several treatment procedures are recommended for acromioclavicular (AC) joint cyst removal, many of these therapies that primarily involve aspiration and surgical excision, are attributed to high recurrence rates. To avoid cyst recurrence and provide a satisfactory final outcome for the patient, an optimal strategy remains to be defined. <h3>Case</h3> We present the case of a 79-year-old male patient with an AC joint cyst on his left shoulder due to cuff tear arthropathy (grade 4b according to the Hamada classification). Treatment by arthroscopic AC joint débridement, resection of the lateral clavicle, open cyst excision, and suturing the remaining AC joint capsule showed no recurrence of the cyst or AC joint instability at the final follow-up of 2.5 years. The patient rated the final cosmetic results, his improved social well-being and his shoulder function as satisfactory. <h3>Conclusion</h3> Arthroscopic-assisted treatment enables joint preserving surgical treatment of an AC joint cyst without impairing future endoprosthetic care. By suturing the capsule, additional graft enhancement for supporting the AC joint capsule is not required. Resection of the lateral clavicle seems to determine the rate of recurrence and is therefore strongly recommended.
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