cats hind legs

Question
I have a cat that is almost 2 years old and he is acting like there is something wrong with his back legs, he doesnt seem to play as much as he use to and when he walks he stops sometimes and streches out his leg, it almost seems like he is getting cramping or something. He also limps on it sometimes. I have taken him to 2 differnt vets in my area and they said it may be a pulled muscle, if so how long does that take to heal? It is going on 3 weeks now. The cat was dropped by my son a few days before all of this started happening, I wasnt home when it happened, He said he dropped him when he was about 1 ft. off of the floor. Not sure if this may have something to do with it or not. I am trying to deside if I should find yet another vet to go to or if I should give it more time. Also none of them have taken x-rays or any other testing has been done. If you have any suggestions I would highly apprisiate it.. Thank You.

Answer
A pulled muscle can take weeks to heal.  However, and perhaps because I work with lots of sick kitties, I'd be nervous that perhaps something else may be going on.  

I certainly think an x-ray is a wise decision.  Personally, I would start with an x-ray if this was my kitty.  In my area, a few x-rays are usually about $75.  If it's a physical trauma, inflammation is likely to show up on the film.  If the x-ray is normal, you might want to consider some blood tests.

Not to latch onto one thing, here, because I certainly can't diagnose the kitty, but something that enters my mind is diabetes.  Diabetes, while less common in young cats like yours, is notorious for causing neuropathy in the hind legs.  Weakness, slouching and exhaustion are often the first signs.  And most owners mistake it for laziness or perhaps arthritis.  By the time neuropathy develops, the poor kitty has been very diabetic for quite some time.  

Because I have FOUR highly diabetic cats that require twice daily insulin injections, any cat I see with the first sign of diabetes, I have a glucose test run.  This can be run very inexpensively ($15-$25 tops) with an in-house test at the vet's office using a couple drops of blood.  

Or, if the vet feels it has merit, it can be lumped into a complete blood profile and chemistry test, and perhaps some titer tests for particular infections (including Lyme Disease - the infection spread through deer tick bites that causes joint pain).  This will test for all sorts of organ function and blood cell counts and can help diagnose anything from a viral infection to cancer.  In my area, the full battery typically runs about $120.  Though that is steep, it will answer lots of questions.