Key Takeaways & Executive Findings
- •• Blood flow restriction training significantly improves knee muscle strength, muscle mass, and function after ACL reconstruction compared to traditional resistance training. • A training frequency of at least three times per week yields greater gains in knee muscle mass. • Blood flow restriction training is a low-load alternative that aligns with post-surgical rehabilitation needs. • The meta-analysis included 11 randomized controlled trials with 317 patients, providing robust evidence.
Abstract
OBJECTIVE: Blood flow restriction training is a low-load training method designed to enhance muscle strength and promote muscle hypertrophy. Its characteristics align well with the rehabilitation needs following anterior cruciate ligament reconstruction. However, its actual efficacy remains unclear. Therefore, this study systematically evaluated the effectiveness of blood flow restriction training on knee joint rehabilitation in patients after anterior cruciate ligament reconstruction and compared the differences in knee rehabilitation outcomes between blood flow restriction training and traditional resistance training. METHODS: By searching EBSCO, Embase, PubMed, The Cochrane Library, Web of Science English databases, CBM, CNKI, VIP, WanFang Data Chinese databases and clinical trial center database (ClinicalTrials.gov), 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 October 31, 2024. Two reviewers independently screened literature, extracted data, and assessed the risk of bias of included studies. The meta-analysis was performed using RevMan 5.4 software and Stata 14.0 software. RESULTS: A total of 11 studies involving 317 patients were included. Meta-analysis results showed that blood flow restriction training was superior to traditional resistance training in improving knee muscle strength [SMD=0.75, 95%CI (0.46, 1.04), P < 0.000 01], knee muscle mass [SMD=0.48, 95%CI (0.30, 0.66), P < 0.000 01], and knee function [SMD=2.69, 95%CI (1.32, 4.07), P=0.000 1]. Subgroup analysis showed that when training frequency was ≥3 times per week, knee muscle mass [SMD=0.43, 95%CI (0.23, 0.63), P < 0.000 1] was more improved than traditional resistance training. CONCLUSION: Blood flow restriction training can better improve knee muscle strength, knee muscle mass, and knee function in patients after anterior cruciate ligament reconstruction than traditional resistance training. Moreover, during the rehabilitation period, blood flow restriction training at least three times per week can better increase knee muscle mass.
1. Introduction
The anterior cruciate ligament (ACL) is a crucial structure for maintaining knee stability and function. Its rupture disrupts knee proprioception and may lead to secondary injuries to articular cartilage and meniscus [1]. Surgical reconstruction is the primary treatment for ACL rupture, but during the postoperative period, reduced activity of the affected limb often results in quadriceps weakness and atrophy [2-3]. The most significant declines in muscle strength and mass occur within the first 16 weeks after reconstruction, and quadriceps atrophy can persist for up to two years. Studies have shown that compared to the non-operated limb, knee flexion and extension strength are significantly reduced after ACL reconstruction [4], affecting lower limb function and quality of life, and potentially leading to secondary injuries [5-7]. Therefore, restoring muscle strength is a primary goal in post-reconstruction rehabilitation [8].
Blood flow restriction (BFR) training, also known as occlusion training, involves applying a tourniquet or inflatable cuff to the proximal portion of a limb to partially restrict arterial inflow and fully restrict venous outflow. This method has been shown to enhance muscle strength and promote skeletal muscle growth [9-10]. Compared to traditional high-load resistance training requiring >70% of one-repetition maximum (1RM), BFR training can achieve similar hypertrophic and strength gains using low loads of approximately 20% 1RM with shorter rest periods [11-13]. These characteristics align with the rehabilitation needs of patients after ACL reconstruction, who must avoid high joint loads to prevent re-injury [8,14]. However, the optimal BFR training protocols and their comparative effectiveness against traditional resistance training remain unclear. This systematic review and meta-analysis aims to evaluate the effects of BFR training on knee rehabilitation after ACL reconstruction, providing evidence for its clinical application.
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Chen Ziang, Li Qinlong, Wu Xue, Zhou Yue (2026). Meta-analysis of blood flow restriction training to improve knee function and muscle strength in patients after anterior cruciate ligament reconstruction. Chinese Journal of Tissue Engineering Research. https://doi.org/10.12307/2026.21431
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Frequently Asked Questions
What is blood flow restriction training?
Blood flow restriction (BFR) training, also known as occlusion training, is a method that uses a tourniquet or inflatable cuff on the proximal limb to partially restrict arterial blood flow while fully restricting venous return. This allows for significant physiological adaptations and muscle growth even with low exercise loads.
How does blood flow restriction training compare to traditional resistance training for ACL reconstruction rehabilitation?
According to this meta-analysis, blood flow restriction training is more effective than traditional resistance training in improving knee muscle strength, muscle mass, and function after ACL reconstruction. It also allows for lower training loads, which may be safer for the healing graft.
What is the recommended frequency for blood flow restriction training after ACL reconstruction?
The study suggests that performing blood flow restriction training at least three times per week during the rehabilitation period can lead to greater improvements in knee muscle mass compared to traditional resistance training.
What were the main outcomes measured in the meta-analysis?
The main outcomes were knee muscle strength, knee muscle mass, and knee function. The analysis included 11 randomized controlled trials with a total of 317 patients.
Are there any limitations to this meta-analysis?
Yes, limitations include variations in BFR protocols and traditional training regimens across studies, differences in participant demographics, potential publication bias, and the lack of raw data from some studies, which may affect the comprehensiveness of the analysis.
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