Association between a Concomitant Anterolateral Ligament Tear and Pivot Shift Before and After Single-Bundle Anterior Cruciate Ligament Reconstruction: A Retrospective Cohort Study
DOI:
https://doi.org/10.3889/oamjms.2022.9230Keywords:
Anterolateral ligament injury, Anterior cruciate ligament injury, Single-bundle acute anterior cruciate ligament reconstruction, Pivot shiftAbstract
BACKGROUND: Regardless of the type of intra-articular anterior cruciate ligament (ACL) reconstruction performed, a certain degree of rotatory instability is often seen after surgery. Recent studies suggest that the anterolateral ligament (ALL) plays a significant role in maintaining stability during internal rotation of the tibia at high knee flexion angles. Unrecognized damage to the ALL may potentially be associated with a positive pivot shift despite a surgically reconstructed ACL being done.
AIM: The primary objective of this study was to determine whether a concomitant ALL tear is associated with a high-grade pivot shift before and after ACL reconstruction.
METHODS: This study was a retrospective cohort study of patients that underwent single-bundle ACL reconstruction surgery in our institution from October 2014 to March 2017. One hundred and forty-four patients were included in this study. All data were extracted from the department of ACL registry. All knee MRIs were reviewed by the author and coauthor to determine the integrity of the ALL. Subjects were divided into two groups based on the grade of pivot shift before surgery. The prevalence of ALL tear based on MRI was further compared between high-grade and low-grade pivot-shift groups.
RESULTS: Overall, the prevalence of a concomitant ALL tear was 70.83%. Comparing the prevalence of concomitant ALL tear between the high-grade pivot-shift group (73.11%) and low-grade pivot-shift group (60%), we had insufficient evidence to demonstrate an association between pre-surgery high-grade pivot shift and concomitant ALL tear. After surgery, none of the patients had a high-grade pivot shift or was positive for Lachman’s test.
CONCLUSION: There is a high prevalence of concomitant ALL tear in patients with torn ACL. We have insufficient evidence to demonstrate an association between the presence of a torn ALL and high-grade pivot shift before and after single-bundle ACL reconstruction.Downloads
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