A100: Effect of Blood Flow Restriction Training on Knee Rehabilitation After ACL Reconstruction: A Systemic Review

Purpose: To systematically evaluate the effect of blood flow restriction training on knee rehabilitation of patients with anterior cruciate ligament reconstruction and compare the effect of blood flow restriction training and traditional resistance rehabilitation training on knee rehabilitation of patients with anterior cruciate ligament reconstruction. Method: The databases of EBSCO, Embase, PubMed, The Cochrane Library and Web of Science were searched, and the randomized controlled trials of knee rehabilitation after anterior cruciate ligament reconstruction were collected. The search time was from the establishment of the database to June 31st, 2023. After two researchers independently screened the literature, extracted the data and evaluated the bias risk included in the study, they used Stata version 14.0 software for meta-analysis. Results: A total of 8 studies were included, including 203 patients. Meta-analysis showed that blood flow restriction training was superior to traditional resistance rehabilitation training group in improving knee muscle strength [SMD=0.76, 95% CI: (0.42, 1.09), P < 0.001], muscle mass around knee joint [SMD=0.71, 95% CI: (0.36, 1.06), P < 0.001] and knee joint function [SMD=4.22, 95% CI: (2.18, 6.26), P < 0.001]. Subgroup analysis showed that the rehabilitation effect of muscle mass around knee joint [SMD=0.53, 95% CI: (0.06, 1), P=0.03] was more effective than that of traditional resistance rehabilitation training group when training times were ≥ 3 times per week. Conclusion: Blood flow restriction training can improve knee muscle strength, muscle mass around knee joint and knee joint function more effectively than traditional resistance rehabilitation training after anterior cruciate ligament reconstruction. It is suggested that training three times a week or more during rehabilitation can better improve knee joint muscle mass. At the same time, pretreatment of long-term blood flow restriction training for 4–8 weeks before operation is more beneficial to the rehabilitation of knee joint after operation.