My 13 yr old babygirl hurt her knee playing basketball. Hoping someone could tell me if this will probably require surgery.? FINDINGS: There is a pattern of acute bone contusion and microtrabecular fracture within the weightbearing lateral femoral condyle within the posterior lateral tibial plateau and within the weightbearing medial femoral condyle. There is concavity and deepening of the lateral condylopatellar sulcus at the site of the lateral femoral condyle contusion. This pattern of bone edema/contusion is associated with ACL injuries. The anterior cruciate ligament appears torn. There is mild anterior translation of the tibia relative to the femur within the lateral joint compartment, a secondary sign of ACL instability. The posterior cruciate ligament is intact. The extensor mechanism of the knee is normal. There is a moderate knee effusion. Patellofemoral alignment is maintained. The patellar retinaculum is intact. There is a focal area of cartilage fissuring and injury within the lateral patellar facet, measuring 2 mm. There is focal underlying bone edema/contusion. The femoral trochlear cartilage is preserved. The weightbearing medial and lateral compartment cartilage surfaces are edematous but preserved in thickness. The medial and lateral collateral ligament complexes are normal. There is mild intrameniscal signal within the posterior horn of the medial meniscus with close approximation but no definite extension to the surrounding articular surfaces. IMPRESSION: 1. Acute anterior cruciate ligament tear with associated bone contusion and microtrabecular fracture within the weightbearing lateral femoral condyle, posterior lateral tibial plateau, and weightbearing medial femoral condyle. There is concavity and compaction injury of the lateral condylopatellar sulcus within the lateral femoral condyle due to the injury. 2. Contusion is present within the posterior horn of the medial meniscus; however, no meniscal tear with articular surface extension is appreciated.