Sounds just like a former foster. She had a broken leg that didn't heal properly and she did have the surgery. She runs and plays just like a normal cat, but will always have issues with her leg. She will run into severe arthritis issues when she gets older. To tell the truth, I was so determined to save her leg that I refused to consider something I would do if I could go back in time: amputation. I DO have a 3-legged cat and she's 100% perfect and amazes me every day with her ability to do anything she wants to do. And she will never have any problems anymore. I wish I could have provided Angel with the freedom of lifelong problems, but I was determined to have her heal and be a complete cat. She healed, but not perfectly and DOES have problems to this day (2 years later)