Help request -- advice with maine coon 'clicking' when walking

[dantm]

Our 3.5 year old female Maine Coon has recently developed a 'clicking' sound when walking. It occurs on all sorts of surfaces and it's not her nails or anything stuck in her feet. We traced it down to either some ligament or brittle bones.

The cat behaves fine and eats/sleeps/plays/walks normally, just there is a faint click with every other step she takes. I picked her up and tried to gently feel her limbs and once or twice (randomly) I could almost make her leg 'click' by playing with her.

We have an appointment with a top orthopedic vet but it's not until ~10 days from now; our regular vet said that he would not be alarmed. I did some research and for some pets (cats, dogs) it looks like there may be some issue of ACL injuries/etc.

Any thoughts or resources on Maine Coons for this issue? Is it a known problem?

Thank you.