cna you tell me the signs of fibrotic myopathy in cats ...

Fibrotic myopathy is a very uncommon condition in cats. It occurs as a result of deposition of fibrous connective tissue within the semitendinosus and, occasionally, the quadriceps muscles of the hindleg. Theoretically a similar problem could occur in a front limb, but the only documented cases (I've only ever seen two such case reports) I know of both occurred in the hindleg. The cause for the disorder is unknown but could be associated with some sort of trauma. In dogs, it's believed that the condition may occur more often in those dogs that are very active; the increased activity may predispose them to more muscle strain. I don't see this being a huge concern for cats.
The condition is not painful and may progress a bit from initial onset of signs. Affected animals are usually unable to extend the hip, knee (stifle) or ankle (hock) joints very well. So they walk short-strided and at the point that the leg should be in extension, it quickly pulls back up into flexion. Often the paw and knee will turn in a bit when flexion occurs.
In the case studies that I saw, steroid therapy was tried but was unsuccessful. Surgery to remove the fibrous band of tissue was then performed which restored a normal gait. However, a short time later the band had reformed and the fibrotic myopathy returned. Cats can live a full, comfortable life with this condition. They just walk a little funny.
If your cat has fibrotic myopathy, your veterinarian may want to document the condition because, again, it's quite uncommon.
I hope this was helpful.Vet help38863.6560805208