Older Age and Surgical Delay May Affect Medial Meniscus Repairability During Anterior Cruciate Ligament Reconstruction in Adolescents and Young Adults

Background: In the setting of meniscus pathology, earlier treatment of meniscus tears may increase the likelihood of repair in young patients. Moreover, delayed anterior cruciate ligament reconstruction (ACLR) has been associated with an increased risk of meniscus injury. There is, however, limited data on the relationship between surgical delay and meniscus repairability in the setting of an ACLR in young patients. Purpose: The purpose of this study was to examine meniscus tear patterns and the likelihood of repair at the time of ACLR in young athletes, and specifically, to determine whether age and time from injury to surgery are correlated with tear patterns or meniscus repairability. Methods: Records were retrospectively reviewed on patients aged 13-25 years who underwent primary ACLR from January 2017 through December 2017. Patients with multi-ligament knee injuries were excluded. Demographic data were collected including age, sex, BMI, race/ethnicity, insurance status, primary sport, mechanism of injury, and time from injury to surgery. Operative reports were reviewed to document meniscus tear type/pattern and all concomitant pathology/procedures. Univariate and logistic regression analyses were used to determine factors associated with meniscus repair. Results: 89 eligible patients underwent ACLR during the study period. 59 (51% females) with mean age 19.3 ± 3.4 years had concomitant meniscus pathology and were included for analysis. The mean time to surgery was 5.2 ± 7.4 months. Combined medial and lateral meniscus tears accounted for 37% of tears, followed by lateral (32%) and medial (31%) tears. For tear type, medial and lateral tears were most commonly vertical (57.5%) and complex (34%), respectively. Surgical repair was performed in 67.5% of medial tears but only 34% of lateral tears. Univariate analyses demonstrated a statistically significant correlation between medial meniscus repair and time to surgery ( p=0.01) and age ( p=0.01), with repair less likely with a surgical delay >3 months and age >18 years. However, time to surgery was not significant after adjusting for age. There was a statistically significant difference in age between those with a surgical delay > 3 months (20.6 ± 3.4 vs.18.3 ± 3.0; p=0.01). Age and time to surgery did not affect the location or type of meniscus tear. There was no correlation between other demographic or surgical variables and time to surgery. Conclusion: In the setting of concomitant ACL and medial meniscus injury, age >18 years and surgical delay >3 months may decrease the likelihood of medial meniscus repair in young athletes.