Heard the pop but able to walk and no severe pain?

I was playing basketball and after a layup in traffic, i landed only on my right leg which i then heard/felt a cracking/popping noise and fell instantly to the ground (assuming my knee buckled and gave out)......but i was able to get up and walk without any assistance. At the moment, my knee still has all its range of motions and there is no severe pain (knee just feels a little stiff) and no significant swelling. I'm wondering if the cracking/popping noise is ALWAYS correlated to an ACL injury? or is it possible that the my ACL is fine despite hearing the infamous popping/cracking noise? Thanks for any help!