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Background The Grammont-style reverse shoulder arthroplasty (RSA) has demonstrated complications intrinsic to its design such as tuberosity fracture and scapular notching. A new short-stem press-fit humeral component with an onlay tray has been devised to avert these issues. We hypothesize that the clinical outcomes and rates of humeral complications of this new stem will be comparable to those of the traditional Grammont design and the lateralization obtained from the stem’s lower neck-shaft angle will decrease the rate of notching without creating instability. Methods We retrospectively evaluated 100 patients who underwent RSA with an onlay short-stem humeral component with a minimum follow-up of 2 years. Clinical outcomes as well as standard radiological examinations were documented pre- and postoperatively. Several correlations were analyzed. Results At mean 32.6-month follow-up, the cohort demonstrated a significant improvement in several outcomes: Constant score increased from 25.5 to 69.7 points, mean anterior elevation increased from 82.1° to 141.9°, external rotation from 5.6° to 25.1°, and internal rotation from sacrum to the L3 vertebral level. There was a 30% rate of stem malalignment and 37% rate of scapular notching, not associated with any adverse clinical outcomes. The overall rate of complications was 15%, of which scapular fractures were most common (5%). Conclusion Our short-term results suggest that the clinical outcomes and rates of humeral complications are similar to those reported for the Grammont RSA, demonstrating less scapular notching, but increased scapular stress fractures and potential subsidence of the prosthesis due to the metaphyseal press-fit require further investigations.

Introduction As the revision number of shoulder arthroplasties increases, we focused on the difficulties of extracting or converting the humeral stem. The purpose of this multicentric study was to assess the outcomes and the radiographic results of a new, short, and convertible humeral stem (Aequalis Ascend™ Flex, Tornier SAS–Wright Medical Inc®, Bloomington, MN, USA), which could settle these complex revision problems. Methods Sixty-six primary shoulder replacements were enrolled with an average follow-up of 25.6 months (24–30.8 months). There were 24 reversed shoulder arthroplasty (RSA) and 42 anatomical shoulder arthroplasty. The functional outcomes were evaluated with the Constant-Murley score (CS) and the active range of motion. Humeral stems were radiologically analyzed at the last follow-up with special care to mechanical complications and bone resorption. Results The average CS improved from 30 preoperatively to 74 postoperatively ( P