Patient: Examination and laboratory tests: MRI findings: a thick linear T2W high signal shadow was seen in the posterior horn of the left knee medial and lateral meniscus, extending to the edge of the articular surface (grade III signal) A watery signal shadow with a cystic band of T2W high and T1W low was seen in the posterior aspect of the joint, measuring approximately 1.2*2.0*2.9 cm, with internal separation visible immediately adjacent to the edge of the medial meniscus. The anterior and posterior cruciate ligaments and the peroneal collateral ligament were not abnormal. There was no significant abnormality in the tibial collateral ligament and a small amount of effusion in the joint cavity (tear of the posterior horn of the medial and lateral meniscus of the left knee with a medial parameniscal cyst). Physician’s examination: no swelling of the left knee, intermittent medial pressure pain. Mobility is normal, McMahon’s disease (-) Lachman’s test (+) MRI: left knee posterior horn of meniscus injury, physician suspected ACL injury. History: The child learned volleyball in a gymnasium for almost 1 year. 5 months ago he sprained his left knee and had pain after the injury. The pain is obvious when squatting, running and sprinting, and strenuous exercise. Do I have to have surgery? My child is just in his first year of junior high school, so can I treat it conservatively? If so, can I still practice volleyball afterwards? Thank you! Doctor: Can you tell if the ACL is damaged or torn? Generally, it is a comprehensive judgment, not just an MRI. From the examination and the meniscus damage, there is a high probability of ACL damage. Upload the MRI if convenient. Do I have to have surgery? My child just started his first year of junior high school, can I treat it conservatively? If so, can I still practice volleyball afterwards? Conservative treatment means no more volleyball practice, and without reconstruction of the anterior cross, the knee joint will deteriorate quickly if the child continues to play sports. It is now possible for a 13 year old to reconstruct, and with good post-operative rehabilitation, it is possible to regain the previous level of athleticism. Patient: Thank you very much Dr. Feng! The MRI has been uploaded, is meniscal injury considered serious? Can we tell if the ACL is damaged or torn? The child is 13 weeks old and the epiphysis is not closed. Can meniscal repair or suturing be done together with ACL reconstruction? Will ACL reconstruction affect his growth and development? I am looking forward to his recovery. Thank you! Doctor: Is meniscus damage considered serious? The medial meniscus is more severe and the posterior horn tear is larger and needs to be trimmed or sutured. Can you tell if the ACL is damaged or torn? Can meniscus repair or suturing be done together with ACL reconstruction when there is a rupture child is 13 weeks old and the epiphysis is not closed? Will his growth and development be affected if ACL reconstruction is done now? Yes, it can be done together for better results. The effect on development is relatively small, usually 2-3 mm, and not easily noticeable. Before the surgery, the joint movement must be normal, and there must be no extension or bending. The muscle strength should be basically normal.