ACL Reconstruction vs Internal brace augmentation

Abstract

Introduction: Anterior cruciate ligament (ACL) injuries are common, and while traditional autograft reconstruction is the gold standard, it has drawbacks including donor site morbidity and a high long-term risk of osteoarthritis. This has driven the development of modern techniques, such as ACL repair augmented with an internal brace, which aims to preserve native tissue and enhance healing.

Methods: This review synthesizes findings from a range of studies, including historical analyses of graft types, studies on rehabilitation and osteoarthritis risk, a retrospective study comparing augmented repair with reconstruction, case series, and a systematic review and meta-analysis with a minimum two-year follow-up.

Results: Traditional ACL reconstruction using autografts offers high resistance but is associated with complications like anterior knee pain and does not fully prevent osteoarthritis progression. Augmented primary repair with an internal brace provides mechanical support to the healing ACL, enhances the graft's biomechanical properties, reduces cyclic displacement, and may allow for earlier rehabilitation. Some analyses suggest modern augmented repair techniques may yield comparable or superior outcomes to traditional reconstruction in specific patient populations.

Discussion: The surgical field is trending towards less invasive, tissue-preserving techniques. The internal brace acts as a "safety belt," sharing the load with the graft during the vulnerable ligamentization phase, which can take up to a year. This may reduce graft elongation and improve stability. However, much of the supporting evidence is from short- to mid-term studies, and the long-term durability and efficacy in preventing osteoarthritis remain to be definitively established.

Conclusion: While autograft ACL reconstruction remains the established standard, augmented ACL repair with internal bracing is a promising alternative that may improve outcomes. Further long-term research is essential to validate its effectiveness and solidify its role in clinical practice.