cow and sickle hocked???

idk if this is the best place to put this but i asked people to critique my horse p.k. and they were saying that he was cow and sickle hocked.i have a faint idea what cow hocked is but i have never heard of sickle hocked.is there a diffrence in the two? and do they inhibit the horses performance?thnx!

They are two different things and both difficult to critique from a photo IMO
Here is a really good article on leg sets. Its well worth the read and not to terribly long- Leg Set: Its Effect on Action and Soundness of Horses