26dkou159 10.3205/26dkou159 urn:nbn:de:0183-26dkou1599 Meeting Abstract Imiolczyk Imiolczyk Jan-Philipp JP

Schulthess Klinik, Zürich, Schweiz

author Vetter Vetter Philipp P

Schulthess Klinik, Zürich, Schweiz

author Schneller Schneller Tim T

Schulthess Klinik, Zürich, Schweiz

author Freislederer Freislederer Florian F

Schulthess Klinik, Zürich, Schweiz

author Lazaridou Lazaridou Asimina A

Schulthess Klinik, Zürich, Schweiz Department of Anesthesiology, Brigham & Women’s Hospital and Harvard Medical School, Boston, USA

author Scheibel Scheibel Markus M

Schulthess Klinik, Zürich, Schweiz Center for Musculoskeletal Surgery, Charité-Universitätsmedizin, Berlin, Deutschland

author German Medical Science GMS Publishing House

Düsseldorf

610 20261020 engl This is an Open Access article distributed under the terms of the Creative Commons Attribution 4.0 License. Dieser Artikel ist ein Open-Access-Artikel und steht unter den Lizenzbedingungen der Creative Commons Attribution 4.0 License (Namensnennung). M0659 159 Deutsche Gesellschaft für Orthopädie und Unfallchirurgie Deutsche Gesellschaft für Orthopädie und Orthopädische Chirurgie Deutsche Gesellschaft für Unfallchirurgie Berufsverband für Orthopädie und Unfallchirurgie Deutscher Kongress für Orthopädie und Unfallchirurgie (DKOU 2026) Abstracts | Schulterprothetik 2 Berlin 20261020 20261023 DKOU26_Abs_2298 TextObjectives and questions: Bipolar metallic lateralisation reverse shoulder arthroplasty (RSA) has been developed to prevent common problems associated with the historical Grammont concept. According to comparative studies, in patients with primary osteoarthritis (OA) and cuff tear arthropathy (CTA), the best results have been achieved with lateralized–distalized (“Frammont”) RSA designs compared with the medialized “Grammont” design and the lateralized “Frankle” design. The aim of this study was to compare the clinical and radiological results of two lateralized–distalized “Frammont” RSA designs in patients with primary OA and CTA.Material and methods: In this retrospective study based on prospectively collected datasets, patients with CTA and primary OA were identified. Two lateralized–distalized RSA designs were included, based on metallic augmentation (centric +3 mm or eccentric Full Wedge) and humeral stem type, with two different short stems implanted (Ascend Flex [AF] or Perform Humeral System [PHS]). Groups were divided according to metallic augmentation and defined as PHS-FW and AF-3. Using data from a local shoulder arthroplasty registry, longitudinal changes in patient-reported outcome measures (PROMs), shoulder range of motion, and abduction strength were analyzed using linear mixed-effects models. Fixed effects included time (baseline, 6, 12, and 24 months), group and their interaction to assess differential temporal effects across implant configurations.Results: A total of 164 patients were included, 84 patients in the AF-3 group and 80 patients in the PHS-FW group. Overall, 101 patients (62%) CTA and 63 (38%) primary OA. Female patients accounted for 58% of the AF-3 group and 53% of the PHS-FW group. Mean Age, BMI, distribution of ASA risk categories, admission type, smoking status, alcohol consumption, and surgical indication were comparable between groups, indicating balanced baseline demographic and clinical characteristics. All evaluated outcomes improved significantly over time, including abduction strength, range-of-motion, PROMS (pain (NRS), quickDASH, SPADI, Subjective Shoulder Value and Constant Score (all p < 0.001)). However, no significant differences were observed between implant design groups for any outcome, and no group-by-time interaction effects were detected. Specifically, improvements in PROMS, range-of-motion, and abduction strength were comparable between groups at all follow-ups, indicating equivalent clinical trajectories across implant designs. Between both implant groups there were no significant differences in any adverse event (all p ≥ 0.20).Discussion and conclusions: Both lateralized–distalized RSA designs provided equivalent clinical and radiological outcomes in patients with CTA and primary OA. Future research should explore cluster-based outcome stratification and longer-term follow-up to identify patient subgroups that may differentially benefit from specific lateralized–distalized RSA designs. 0 0 0 0