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I am sorry to hear you are worried about this mass on Dusty's knee. My name is Rebecca. I am a veterinarian and will do my best to help.
Is he limping on that leg, or is he putting full weight on it? Does the mass feel warm?
This could be an infection, or it could be a reaction to the pins in his knee from the surgery. I would get a sample of the fluid, and look at it under the microscope, to be sure it is not infection. I would also take an Xray to see if the surgery pins are in place, that nothing has become loose or moved. It might need another surgery, but it might not; more information is needed.
Let me know if he is using the leg or not, if he is taking any medication, and what other questions I can answer.
Good he is using the leg. If it were an infection, or a problem with pins, he would probably limp on it. I would get an Xray, if he starts to limp on it.
I assumed there were pins or some type of fixation, but you would have to ask your surgeon. I am a general practitioner, so I don't do this surgery myself.
If he is using it, that is a good sign. It could heal by itself. If it does not, then possibly the joint capsule may need to be sewn up, but there is a good chance that won't be necessary. Keep following up with your surgeon; he knows exactly what was done at the time of surgery.
Let me know how Dusty is doing and if I can answer any more of your questions. Was this helpful?
How is Dusty doing?