Which video? There were two and the limping was different for both... On and off lameness can happen in both knee problems, with minor display. I chose videos where the limp is blatant, so you could see the subtle differences in both conditions. If the drawer test is successful by a Vet, then there is damage. When done correctly, there is not enough pressure applied to damage the knee if nothing is wrong, trust me. Those ligaments are fairly hardy. If the drawer test is unsuccessful, yet produces a pain response, there may be damage, but no complete tear. I would feel more comfortable having a Vet do it rather than try yourself, when you don't know what you are feeling for... No. The OFA test is for patellar luxation, not CCL stability. Two separate, yet possible causes on the rule out list. Either way, take the dog to your Vet. Regardless of what protocol you decide to follow, a Vet will be able to decipher the difference and what is truly wrong here (especially if you can't see the differences in the videos). Without this knowledge, you may follow the wrong protocol and not address the true issue.