Abstract:The concept that torn anterior cruciate ligament (ACL) cannot heal is changing with the comprehensive understanding the basic biology in recent years. There has been a renewed interest in repair of acute ACL tear with newer internal brace technique, which had been proven to reduce relaxation and micromotion by sharing the load of ACL after repair, and provides a stable environment for ACL tissue healing. The ACL repair with internal brace technique is a promising treatment for acute proximal ACL tear, which not only lead almost the equivalent efficacy to standard anterior cruciate ligament reconstruction (ACLR), but also reduce the pain and speed up the rehabilitation. However, there still is a lack in terms of quantitative standards of age, level of sports participation and timing of treating while patient select- ed. In this paper, research progress in anterior cruciate ligament repair with internal brace is reviewed to evaluate the practical significance of this technique.