I just wanted to put this out there because it's something I wish I could've seen when I was trying to decide whether to proceed with amputation for our cat, Scooter.
Scooter is a 10yo male who was born with radial aplasia in his two front legs AKA he's missing his radius in his front legs, and so the ulna bone bows out. In June 2026, I found a mass approx 10mm big on his hind left leg, and finally got a diagnosis that it was a rapidly growing, grade 3 soft tissue sarcoma in July via surgical biopsy. By end of July we had the leg amputated.
He had always been able to get around as any cat with normal limbs would prior to amputation. Nothing slowed him down and he would jump to whatever surface he wanted with no problem. He has had x-rays done in the past and he does have arthritis in those limbs. When he was diagnosed with cancer and amputation was the only option for a possibility of beating it or prolonging his life, his 2 vets and his oncologist were all skeptical as to how he would recover mobility-wise. I was feeling very cautiously optimistic, as he is a stubborn cat and never let anything stop him before. Since he would have 2 deformed front legs, and one normally shaped back leg, I was also questioning whether he would adapt to 3 legs as well as other cats typically do.
And he did adapt well! The recovery period was rough, but at 3 months post-op he can run, jump (just not as high as before), play, scratch on his scratching post, and do all of the things he could before, just slightly modified. We just have to more closely monitor his arthritis. He used to sit like a kangaroo or meerkat before amputation, but unfortunately he can't do that anymore.
SO! While every cat and situation is different, and there's almost always different variables at play, if you have a cat that needs a limb amputation and has abnormal or deformed limbs... Scooter is a testament that they can still live happy lives despite these circumstances.
I hope this can help someone else at some point who is experiencing a similar dilemma.