Joint Preserving Treatment of Chronic Locked Posterior Shoulder Dislocation by Means of Combined Humeral Allograft Reconstruction and Posterior Glenoid Autograft Augmentation.

Chronic locked posterior shoulder dislocations are challenging to treat and often warrant total shoulder arthroplasty. While joint preserving treatment is preferable in young patients, surgical techniques to treat this pathology have rarely been described in the literature. This technical note presents the treatment of a 30-year-old male patient with a chronic locked posterior shoulder dislocation by means of combined humeral allograft reconstruction and posterior glenoid autograft augmentation. Restoration of the spheric humeral head surface was obtained using a fresh-frozen femoral allograft fixed with two reabsorbable screws. Due to the intraoperatively persistent posterior instability after humeral reconstruction, the posterior glenoid was augmented with a tricortical iliac crest autograft, which was fixed with two metal screws. This treatment strategy resulted in a full range of motion and a centered stable shoulder joint at one-year follow-up. Therefore, the procedure of segmental reconstruction of the humeral head with a fresh-frozen allograft combined with a posterior glenoid augmentation with an iliac crest bone autograft is a joint-preserving treatment alternative to shoulder arthroplasty in young patients when humeral head reconstruction alone does not suffice.