Factors associated with the increased risk of lateral menisc
A Study was conducted to determine the risk factors for lateral meniscus and root tears in patients with acute anterior cruciate ligament (ACL) injuries that involved steep posterior lateral tibial slope, bone contusion on lateral compartments and combined medial collateral ligament injury.

A total of 226 patients undergoing acute ACL reconstruction were included in the study sample. The patients were divided into groups based on the presence of lateral meniscus and root tears by arthroscopy. Binary logistic regression was used to analyze risk factors including age, sex, body mass index (BMI), injury mechanism (contact/non-contact), Segond fracture, side-to-side laxity, location of bone contusion, medial and lateral tibial and meniscal slope, mechanical axis angle, and grade of pivot shift.

--Overall lateral meniscus (LM) tears were identified in 97 patients, and LM root tears were found in 22 patients.
--The risk of an LM tear in ACL-injured knees increased with bone contusion on LTP (odds ratio [OR], 3.5), steeper lateral tibial slope (OR, 1.133), MCL injury (OR, 2.618), and non-contact injury mechanism (OR, 3.132) in logistic regression analysis.
--The risk of LM root tear in ACL-injured knees increased with high-grade pivot shift (OR, 9.127) and steeper lateral tibial slope (OR, 1.293).

Finally, if major risk factors such as bone contusion on the lateral compartments, MCL fracture, and a steeper lateral tibial slope are present, the increased risk of LM lesions in acute ACL-injured knees should be considered. Furthermore, high-grade rotational damage and a steeper lateral tibial slope are both major risk factors for LM root tears, so clinicians must be cautious not to overlook those lesions.

Source: https://link.springer.com/article/10.1007/s00167-021-06504-z