Nunes B, Linhares D, Costa F, et al. - In this study, the clinical and functional outcomes and complications of S-RSA were compared with Lateralization in Reverse Shoulder Arthroplasty (L-RSA), and to evaluate the individual results of metallic and bony lateralization implants. Between January 1980 and December 2019, a systematic search was conducted. By two independent reviewers, studies were selected in two phases; disagreements were solved by discussion. Researchers included 15 articles / Sixteen studies (865 participants-440 L-RSA and 425 S-RSA). The results indicated significantly lower notching and complication rates in L-RSA groups. This review indicated similar results in clinical scores and a slight advantage for L-RSA in range-of-motion, particularly in ER. L-RSA was not correlated with elevated revision rates, while presenting lower complication and notching rates. While heterogeneity and low evidence levels of the included studies may limit the conclusions, the inclusion of studies with metallic and osseous lateralization has helped to give further evidence on this subject.