Flexible exoskeleton-assisted training enhances lower limb motor function after stroke: a systematic review and meta-analysis

Background: Recent advances in flexible exoskeleton technology have broadened its application in stroke rehabilitation, particularly for improving motor functions in the affected lower limb. This review examines the impact of flexible exoskeleton-assisted training (FEAT) compared to conventional therapy on balance, motor functions, and gait parameters in post-stroke patients. Methods: We conducted a meta-analysis using data from randomized controlled trials (RCTs) identified through database searches and manual screening, focusing on outcomes such as balance (Berg Balance Scale, BBS), lower limb motor functions (Ten-Meter Walk Test, 10MWT; Six-Minute Walk Test, 6MWT; Functional Ambulation Category, FAC), and gait parameters (walking speed, step length, cadence, and symmetry). Results: This meta-analysis included 6 studies with 213 patients. FEAT significantly enhanced BBS scores, and performances on the 10MWT and 6MWT, along with other gait parameters; however, FAC scores did not improve significantly. Subgroup analyses revealed that FEAT with hip assistance significantly improved step length, cadence, and gait symmetry ratio, while ankle assistance improved performance on the 10MWT and 6MWT. FEAT was especially effective in improving step length, cadence, and gait symmetry ratio in patients with a post-stroke duration exceeding three months. Conclusion: Compared to the conventional therapy, FEAT markedly improves the balance, walking ability, and gait parameters in stroke rehabilitation. These findings support the value of FEAT in lower extremity rehabilitation post-stroke, suggesting its integration into clinical programs could enhance the therapy effectiveness or efficiency. In addition, the appropriate type of FEAT needs to be selected in the rehabilitation program based on the patient’s specific impairment. For example, FEAT with hip assistance may be recommended for stroke patients with severe gait asymmetry, aiding the development of personalized interventions.