Can the knee's acl and pcl ligament injuries heal naturally?

Acl/pcl healing: If an acl and PCL tear these ligaments do not typically heal; this is due in part to the synovial environment in which these ligaments reside as well as the demand that is exacted on these ligaments. Whether one is symptomatic with these injuries is in large part measured by the degree of activity in which a patient participates in and the number of hours one is actively engaged.

Acl /pcl: Most of the supportive structures within the knee can not heal as they lack a good blood supply. Thus ,both Acl/ pcl , medial ,lateral meniscus, and the articular surfaces don't / can't heal on their own

Generally not.: If theyre completely torn, they generally cannot heal , and need surgical reconstruction