your anterior cruciate ligament
was considered to be 25% damaged. It implies that this is to the posterior attachment area)
your medial meniscus
) was considered to be 25% damaged.
A ligament is a bundle of fibers together like a rope, and the 25% implies that this amount has be "frayed" either around the edge or in one area.
the flap lesion simply implies that your medial meniscus is torn about 25%; with the "flap lesion" being a common "type" of tear. others include "parrot beak tears" and so on....