I've just noticed that both the CV boots on my Accord are torn and I am going to replace them soon. However, I am also hearing a knocking sound when turning sometimes. Could this just be caused by the torn boots or is there a good chance the CV joints are done as well. There was still lots of grease where the boot was so I'm hoping it was protecting it. Any ideas or opinions would be appreciated and how do I tell if the CV joints are done? Thanks.