Based on your description it’s pretty impossible to tell, it could be something else qeually well. You might want to enlighten us a bit more, e.g. when does this occur, what are your hobbies (namely, do you play soccer or American football or such?) and are there other symptoms than just ‘locking and clicking’?

Also, try googling some information about the problem, there should be plenty.

If it turns out to be ‘turf toe’, the problem can be pretty challenging to treat, especially if you want to play such sports as soccer, or in some cases even if your want to simply run. Nevertheless, demand more from your physician 🙂