Personally, as good as rebounders are for some people, I would be a very wary of it. As Lucky Star says, even the softest rebounder has some impact, unless you just sit there health-bouncing (which, honestly, doesn't look too enjoyable to me). More importantly, I'm not sure rebounders, being unstable, bouncy things, are a great idea for people with joint stability issues - and given the fact that a stabilizing shoes previously helped for your issues, I'm guessing stabilization factors into your problems. I got a rebounder because I avoid impact due to chronic ankle instability. I was surprised to find that the rebounder actually felt worse for my body than full impact on my hardwood floors (full disclosure - it was a cheapie rebounder, but it had elastic/bungee connections and wasn't a really jarring bounce). The spring upward and air time caused my joints to loosen and relax, which is a nice relaxing feeling initially, but bad when I land and everything wobbles. And landing on an unstable surface like the rebounder mat is extra stabilization work. So if the things that are holding your joints together are already overworked - like my overstretched ligaments - I feel like rebounding puts excessive pressure on them. I tried with the rebounder, but bouncing on it, even low and easy, caused my ankles to wobble and hurt - a lot (more than running on concrete sidewalks). Continuing would have been a recipe for a serious sprain. I'm not all that familiar with knee anatomy, but it is my understanding that the meniscus is an important contributor to knee stability. Based on that, I think rebounding is a very bad idea, at least until the tears have healed.
ETA - Oh, and lest I sound like a Debbie Downer, I will say that despite doctors telling me that my ankle stability issues are essentially irreparable/insurmountable, I have made enormous progress by doing research, rehabbing them on my own, and finding gentle physical activity which support, rather than punish them. Despite having suffered through numerous serious sprains/tears over the years and grumbling through numerous long recovery periods, my ankles are now working better than they have in 15 or 20 years. Oh, and Kettlebells are one of the fairly joint friendly exercise techniques I've found. Weak glute medius contributed to my ankle stability issues and addressing that has helped (I think it also can contribute to knee imbalances). Wearing YogaToes regularly also seems to have helped with stability by providing a wider and stronger base to walk on. Just thought I'd add a little glimmer of hope that, even though it looks bad now, I'm sure you'll recover and find a healthy balance of activity, strength and comfort again.
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