Hi thanks for the query.
From the details you had described you must be having damage to the cartilage
inside your knee joints. Regarding the stretched ACL some persons have inborn laxity of joints which could be one of the reason. I would also like to know if you had any history of injury to the both the knees as any form of severe knee injury
may present with these complaints. Regarding the fresh complaints I would advice you to consult your orthopaedic surgeon
who can clinically examine you and advice regarding further management. The popping of the knee joint could be due to ligament injury
or due injury to the meniscus
inside the joint.