Should I limit my Rotweillers movements and running around to help the healing of his limp?

My 7 month old rotwieller Zeus was first limping on his back leg and crying every time he tried to get up, it eventually went away. Now for the past week and a half he has been limping on his front left leg and growls at us if we tried checking for thorns etc. We've taken him to the vet on Saturday and they gave us some anti-inflamatories and checked his weight (30.00 kgs) and it seemed like it was better on saturday evening and Sunday but this today he's limping just the same before the vet.The vet said if it does not heal then we'll have to get x-rays done coz he might have a deformity in his elbow joints. I would just like to ask if it would be better for us to keep him in a crate to limit his running around on the sore leg or not. Please help!!!!