Indications for Lateral Extra-articular Tenodesis in Anterior Cruciate Ligament Reconstruction: A Systematic Review

Background: The anterior cruciate ligament (ACL) is a major sagittal plane stabilizer of the knee joint. Even if anterior laxity can be brought under control by utilizing modern surgical techniques, internal rotational instability may not always be controlled adequately. Various surgical techniques are used to prevent this coronal or rotational instability, such as lateral extra-articular tenodesis (LET). Despite an abundance of articles in recent decades discussing LET in ACL reconstruction, no definitive indicators for extra-articular tenodesis have been described in the literature.Purpose: Given the scarcity of literature assessing the indications in LET, the purpose of this study was to conduct a systematic review of the described indications for this operation in the context of concurrent ACL reconstruction.Study Design: Systematic review; Level of evidence, 4.Methods: We searched PubMed, Cochrane Central, ScienceDirect, Web of Science, and Embase using the following key terms with no limits regarding the year of publication: (extraarticular OR extraarticular) AND (tenodesis OR plasty OR augmentation OR procedure or reconstruction OR reconstructive OR surgical OR surgery OR technique) AND (ACL OR anterior cruciate ligament). We included clinical human studies based on levels of evidence 1 to 4 that were written in English. We excluded studies not written in English, case studies, reviews, letters to editors, conference abstracts, or studies containing incomplete or irrelevant data.Results: The analysis evaluated 29 articles published between 1999 and 2023. We evaluated mostly level 3 (n = 13) and level 4 (n = 12) evidence; however, there were 4 articles with level 1 evidence. The majority of the studies were retrospective (n = 21), although there were prospective studies (n = 8). The mean age of the participants was 24.4 years. The most prevalent indications for LET were high-risk sports (16 articles), medial meniscal repair/excision (11 articles), and pivot-shift test grades 2 and 3 (11 articles).Conclusion: The reviewed articles showed reduced pivoting and laxity, improved clinical outcomes, and decreased revision rates after primary ACL reconstruction. The main frequent and repeated indications for using LET in ACL reconstruction are meniscal surgery, sports activity, and grade 2 and 3 pivoting.