Exercise Therapy for Shoulder Dysfunction in Breast Cancer Patients: A Systematic Review of Therapeutic Effects and Clinical Outcomes

Background Breast cancer treatments, including surgery, chemotherapy, and radiation therapy, frequently lead to shoulder dysfunction manifesting as pain, restricted range-of-motion, and muscle weakness. Exercise therapy has emerged as a potential rehabilitative intervention; however, inconsistent evidence and protocol variability necessitate systematic evaluation. Purpose To evaluate the effectiveness of exercise therapy for managing post-treatment shoulder dysfunction in patients with breast cancer, particularly focusing on pain reduction, functional improvement, and safety outcomes. Study design Systematic literature review Methods We conducted a comprehensive search of PubMed, CINAHL, and Cochrane Library databases for articles published between January 2000 and May 2024. Eight eligible studies (four randomized controlled trials and four systematic reviews) from multiple countries were included. Interventions comprised early mobilization, progressive resistance training, stretching exercises, and combined aerobic and resistance programs, with durations ranging 12 weeks to 12 months. Primary outcomes included shoulder range-of-motion, pain intensity, muscle strength, and adverse events, including lymphedema. Results Eight studies were included in the review. Patients who underwent exercise interventions had significantly improved shoulder range-of-motion, muscular strength, and functional capacity compared to controls. Pain intensity was reduced across multiple studies. Early mobilization within weeks of surgery showed superior outcomes over delayed approaches. Progressive resistance training proved safe and effective without increasing lymphedema risk. Conclusions Exercise therapy is safe and effective for managing post-treatment shoulder dysfunction in breast cancer patients. Early initiation of individualized programs should be incorporated into standard care protocols. Future research should focus on developing standardized guidelines and investigating long-term outcomes.