Ankle sprain/ligament damage that involves cracking. what does this indicate?

Unknown, but...: This may represent a benign side effect of the ankle injury or may indicate something more serious. Whether or not you have pain is central to a diagnosis. I recommend you be seen by a foot and ankle orthopaedic surgeon. One in your area can be found at: www.Aofas.Org.

Many possibilities: It is common for one to experience pain for several months following an ankle injury. Popping may indicate ligamentous or tendinous injury. An MRI may be of benefit in diagnosing your pathology.