That's definitely possible!
There are a few things that I would consider in a cat this age.
1. She may have stretched or ruptured her cranial cruciate ligament. This is something humans get as well, but in humans it is called Anterior Cruciate Ligament.
The cranial cruciate ligament is one of the structures that stabilizes the knee joint. It is prone to problems. If the cat is in motion, and the lower leg is held still (by going down a hole, getting caught on a string, etc) while the upper leg keeps moving forward, there will be damage to this cranial cruciate ligament.
The symptoms seen are usually a sudden onset of hind-end lameness, with toe touching seen at standing and walking, but the cat often carries the leg when running.
Here is more information about this problem:
2. Your cat may have a fracture (broken bone) of one of the bones in the leg. I have seen this many times with a cat getting their toes jammed under something, and then twisting somehow and causing a fracture, usually in the foot area. Symptoms are a sudden onset of non weight bearing lameness, just as you are describing. X-rays would help to diagnose this.
Here is more: http://www.petplace.com/cats/fracture-of-the-digit-in-cats/page1.aspx
3. It is also possible that your Ragdoll has dislocated her hip. This is a common dislocation and again could happen if she trapped his toes under something and then pulled. It is unlikely but certainly possible. With this, again you would have the symptoms of non-weight bearing lameness.
Here is more:
4. And the last thing that I would be thinking about would be a puncture wound.
This can happen from a sharp sliver, or a bite from another animal. When a bite occurs, what happens is that there are 2 puncture holes - one caused by the upper and one by the lower canine tooth. The animal's teeth have a lot of bacteria on them, and these bacteria get placed deep below the skin when the bite occurs. The hole is small and quickly scabs over, leaving the bacteria below there.
The most common type of bacteria in the cat mouth is Pasteurella multocida - and it LOVES to grow in a warm, moist environment that has no oxygen present. And that is exactly what you have with a bite wound!
So, the bacteria multiply, and the body sends in white blood cells to fight the infection, and soon you have a big pocket of pus and bacteria: an abscess! The abscess grows bigger until it ruptures and the pus pours out. This relieves the pressure and allows the hole to close over which then allows the process to start again. Bite wounds, ideally, should be treated with antibiotics within 24 hours of the bite. This prevents the bacteria from multiplying and forming an abscess in the first place.
Here is more information:
So, in summary, there are a number of different conditions that can all give these same symptoms you are describing in your cat.
In order to diagnose this, a veterinarian would have to perform a thorough orthopedic examination, and a neurological exam. The vet might well suggest an x-ray. For this part, it might be necessary to give your cat a pain killer to allow proper positioning for the x-ray without hurting her. I do think your cat needs to see a vet to have this looked at. Something is going on, and the sooner it is diagnosed and treated the better.
Unfortunately, there are NO safe pain killers that you can give at home to help your little one. Tylenol, advil, and aspirin are all very toxic to cats and should NOT be given!
So, since your cat seems to be in pain, I think you are better to see an Emergency Veterinarian today rather than waiting until tomorrow.
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The above is given for information only. Although I am a licensed veterinarian, I cannot legally prescribe medicines or diagnose your pet's condition without performing a physical exam. If you have concerns about your pet I would strongly advise contacting your regular veterinarian.