Just want a second opinion?

I am studying in the vetrenary field and i just recently had litter of wolf puppies, they are 8 weeks old at the moment. Yesterday i let them out of the kennel to play and they all ran out fine , 2 minutes later a puppy was limping and still wont put her leg down , she screams when i move it. I believe that she may have a dislocated kneecap and would like to know if it sounds like it to any of you. I do not want to waste a trip to the vet if i can fix it myself