Hello, It is possible to tore your meniscus without damaging your ligaments including your ACL. However. A torn meniscus does not make your knee Pop out . This strongly suggests a torn ligament. Which ligament, is hard to tell without proper physical examination, or MRI. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Kasper Kristensen, General & Family Physician