You're welcome as always.
I'm glad to hear that she's still getting laser treatments and just delighted that she responded as well as she did. I have limited experience with laser therapy but have heard really great things about them for all sorts of conditions.
The pattern of arthritis for most patients is that they are stiffer and/or lame after laying down for periods of time (or if they overdo it); then as they move around, they loosen up the joint and the symptoms go away. Or, after they rest a bit, if they've exacerbated the condition.
So, this is definitely a possibility. But why they'd both show symptoms at the same time is just bizarre!!! I think they're trying to mess with your head:))))
I can't think of anything genetic which would rear its ugly head now for them; if they were kittens, that would be a different story.
At least she/they are don't appear to be bothered by her lameness...or doesn't appear to be anyway.
If this does turn out to be the problem, then I have a few suggestions; the supplements I mention can be given regardless.
Treatment options for arthritis in cats are more limited than for dogs but options to consider would be:
1 Cosequin for Cats which is a joint supplement that comes in a powder form.
2. Occasional use of anti-inflammatory drugs such as Onisor which is licensed for use in cats but can only be given for three days in a row.
There is a drug called Metacam but it is somewhat controversial in veterinary medicine, at least here in the States. It's use as been associated with significant damage to the kidneys and should be used with great caution in older cats; the drug here in the States currently carries a label to that effect. However, there are some recent studies which indicate that at very low doses, this drug may be beneficial for cat with osteoarthritis.
I know the drug is available in the UK at a different concentration/strength so it may be worth asking your vet about it.
3. Adequan which is basically a stronger supplement but is an injection and needs to be given by your vet.
4. Fish oil supplements such as Welactin which is liquid that can be drizzled in the food. Also available on the internet.
5. Pain medication such as Buprenex can be very useful although it's sometimes difficult to know how painful these patients are.
6. Gabapentin which is another pain drug that would have to be dispensed by your vet but can make some cats sort of loopy.
7. NuCat Senior which is a source of antioxidants to help reduce oxidative damage to joints; available on the internet.
8. Combinations of antioxidants such as Cell Advance (VetriScience)
Keep me posted:) Deb