New publication in International Orthopaedics!

New publication in International Orthopaedics! 
Proud to share this collaborative work from the ShoulderFriendsInstitute registry.
The question was straightforward yet rarely studied with proper methodological rigour: what is the true impact of humeral stem design, Inlay versus Onlay, on reverse shoulder arthroplasty outcomes?
Most published comparative studies mix stems with different neck shaft angles and various glenoid components, making it impossible to isolate the effect of the stem design itself. This is precisely what makes our work original: comparing these two concepts across 227 patients, with a strictly identical 145° neck shaft angle and the same glenoid component, to finally address this question without confounding bias.
At a minimum follow up of 3 years, the results are clear. Both designs deliver comparable clinical and radiological performance in terms of pain, Constant score and Subjective Shoulder Value. The Onlay design, however, stands out with a significant improvement in external rotation at 90° of abduction, without increasing the risk of bony complications or scapular notching.
The clinical takeaway matters: the choice between Inlay and Onlay should ultimately be driven by patient specific functional needs and surgeon experience, while factoring in the degree of intrinsic lateralisation of each stem.
Thanks to our two fellows charlotte Audebert and Thomas Boissinot who carried this project with outstanding energy and rigour. From data collection to final manuscript, their dedication was the driving force behind this study.