Hey Hanna, I have gone through a similar experience as you with being that I had SCFE surgery on both of my hips when I was only 8 years old. However I urge you not to worry about the possible side effects of gymnastics or feeling that your body isn’t safe. Ever since my surgery I have continued to stay active playing baseball, football, and wrestling with little to no pain. I have also weight lifted, however, some squats and leg exercises feel uncomfortable. I hope you come to ease with your body and that you learn to trust yourself and your hips more.
Hey Hannah!
Well, without knowing the relevant clinical details such as the severity of the condition, the precise surgery done, the current status etc. or a detailed clinical evaluation it would be difficult to comment specifically on the situation. Though SCFE predisposes one to degenerative arthritis is future often requiring a joint replacement, the rate of degeneration is variable between individuals. While more than mild-moderate activity is best avoided, there is usually no limitation of regular activities. Though it would be difficult to predict a precise prognosis, I would suggest discussing the situation, the suggested management plan and the expected prognosis in detail with your treating orthopedician.
Hope this is helpful.
Take care!