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

## TL;DR

This paper introduces a new surgical technique using 3D-printed guides to improve the bone block procedure for posterior shoulder instability.

## Contribution

The first description of using a patient-specific guide and ancillary device for posterior bone block surgery.

## Key findings

- A customised cutting guide and HyLa device enable both open and arthroscopic posterior bone block procedures.
- The technique aims to reduce risks like protrusion and long-term arthritis.
- The method combines patient-specific instrumentation with an ancillary device for improved surgical outcomes.

## Abstract

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.