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Hi this is Dr. Hill. Please give me a moment to type my answer. Thank you
Rearlimb lameness in a middle aged cat could be due to arthritis in one of his joints, a partial tear on his anterior cruciate ligament in his knee, a wound or area of inflammation (especially if he goes outside). If Yankee goes outside and the lameness is fairly acute, then I would be most concerned about an injury from a cat fight or other trauma. If he is strictly indoors, then arthritis or a torn ligament would be most likely. Rarely, you can have a partial obstruction to blood flow in the leg associated with a blood clot. I recommend that you have him evaluated by your local veterinarian so that they can localize the area of discomfort and get him started on appropriate pain medications. Please ask any follow up questions. You can continue to post on this thread for a few days, even after rating my response. Take care.