Use of 3D-Printed Patient-Specific Guide for Posterior Bone Block Procedure in Patients With Posterior Shoulder Instability: A Technical Note.

Posterior shoulder bone block using an iliac graft is one of the standard techniques for posterior glenohumeral instability. Whether performed openly or arthroscopically, it appears to deliver the same results but must be performed with technical rigor to avoid the disadvantages (protrusion and impingement with long-term arthrosic risk). We hypothesised that patient-specific instrumentation (PSI) combined with an ancillary device could help optimise the surgical procedure. The technique presented here describes, for the first time, the installation of a posterior shoulder bone block using an iliac crest graft, with a customised cutting guide and HyLa (Latarjet Hybrid, NEWCLIP®) placement ancillary, enabling both open and arthroscopic surgery.