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Objectives: This study aimed to evaluate the safety and efficacy of performing a lateral extra-articular tenodesis (LET) with a modified Lemaire technique (MLT) in conjunction with anterior cruciate ligament reconstruction (ACLR) in children and adolescents at increased risk for failed ACLR. Methods: A consecutive series of patients ≤19 years who underwent simultaneous ACLR and LET with minimum two-year follow-up data were reviewed. Patients were indicated for LET when one or more of the following risk factors were present: participant in high-risk competitive sport such as football, lacrosse, soccer or basketball, grade 3 pivot shift, hyperlaxity (Beighton score > 6), recurvatum, revision ACLR, contralateral ACLR, or chronic ACL insufficiency. ACLR was performed using either full-thickness quadriceps tendon (QUAD) for skeletally immature patients or bone-patellar tendon-bone (BTB) autograft for skeletally mature patients. All-epiphyseal (AE) or complete transphyseal (CT)techniques were used depending on patients' skeletal maturity. At a minimum two-year follow-up, patient-reported outcome measures included Single Assessment Numeric Evaluation (SANE), Pediatric International Knee Documentation Committee (Pedi-IKDC), and the HSS Functional Activity Brief Scale (HSS Pedi-FABS) scores. Return-to-sport (RTS)data and second surgeries were also obtained. Results: Sixty-one consecutive patients (mean age 15.17 ±1.73 years, range 11-19 years, 62% female) were analyzed (Table 1). 59 patients (97%) participated in organized sports including soccer, basketball, football and lacrosse, with soccer being the most popular one. The average grade at the time of surgery was 9th grade. Ten patients (16%) were revision ACLR procedures. Seven (11%) patients underwent AE and 54 (89%) underwent CT ACLR. Forty-two (69%) cases employed a QUAD autograft, while 19 (31%) utilized a BTB autograft. All patients underwent a LET with a MLT and 2 patients underwent simultaneous implant mediated guided growth with a plate for structural genu valgum. At two-year follow-up, mean SANE score was 95, median Pedi-IKDC score was 91, and median HSS-Pedi Fabs score was 27. RTS rate was 91.8%. Ten patients had subsequent surgical procedures, including two hardware removal procedures for hemiepiphysiodesis, three contralateral ACLR, three meniscus surgeries, one lysis of adhesions, and one revision ACLR for BTB graft re-rupture. Two patients were lost to follow-up and excluded from the study. Conclusions: The findings suggest that concomitant LET and ACLR in adolescent patients with risk factors for failed ACLR is associated with favorable patient-reported outcomes, high return to sports participation, and low ACL re-rupture rate at two years follow-up. [ABSTRACT FROM AUTHOR]