Efficacy and Safety of Botulinum Toxin Type A Injection for Trapezius Muscle Contouring: A Systematic Review

Introduction: Botulinum toxin injections have gained popularity in cosmetic surgery for enhancing shoulder aesthetics. This systematic review explores the effectiveness and safety of Botulinum toxin injections in contouring the trapezius muscle. Objectives: To assess the efficacy and safety of Botulinum toxin in shaping the contour of the trapezius muscle for shoulder aesthetics. Methods: We systematically reviewed peer-reviewed articles, clinical trials and case studies. Inclusion criteria included studies reporting the use of Botulinum toxin for trapezius contouring. Data were extracted using PRISMA guidelines. Results: Our review included nine studies. Botulinum toxin injections in the trapezius muscle were effective to variable extents in enhancing shoulder aesthetics in all 121 (100%) cases. Primarily mild and transient adverse events, such as temporary weakness or discomfort at the injection site, were reported in 13 (10.7%) cases. Discussion: The findings suggest that Botulinum toxin type A can be a valuable tool for changing the trapezius contour for improved shoulder aesthetics. The adverse events reported in the literature were generally mild and transient, indicating a favourable safety profile. Further research is needed to address limitations and optimise injection techniques. Conclusion: Botulinum toxin type A injections show promise in contouring the trapezius muscle for improved shoulder aesthetics. Further research should focus on refining injection protocols, standardising outcome measures and addressing safety concerns to maximise the benefits of this procedure for patients seeking shoulder enhancement.