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Atraumatic Dislocation of Constrained Total Scapular Endoprosthesis: A Report of Two Cases

Case: Two patients undergoing constrained endoprosthetic reconstruction following scapulectomy for the treatment of neoplasm sustained atraumatic glenohumeral dissociation. To our knowledge, this complication had not been observed in association with anatomic-orientation constrained designs prior to 2014. Conclusion: Despite the improved stability associated with constrained total scapular endoprosthesis designs, every effort should be made to reconstruct the joint capsule and consideration should be given to augmentation with use of a synthetic sleeve. However, even when these measures are taken, dislocations of the constrained glenohumeral articulation may occur. Treatment of dislocations should be based on patient-specific factors, and nonoperative treatment may be appropriate. In the setting of dislocation associated with constrained liner wear, limited revision may be considered. Reassessment of periprosthetic tissue-balancing and potential augmentation should be considered.