My experience, and I've had both knees replaced, is that strengthening the muscles around the knee prior to surgery makes recovery must more tolerable. I did this for one year prior to each TKR working with a trainer/kinesiologist. And then, absolutely obsessing over the post-op exercises. I believe this keeps scar tissue way down.

The quadriceps and hamstring muscles hold the knee components in place. Post op PT gets you back to 120 degrees or more of flexion and zero degrees, or very near zero, of etension. From there, you can slowly add strength to these muscle groups and "tighten" the knee capsule.

In my opinion, this prevents scar tissue and also helps to reduce or eliminate clicking sounds from the prostheses.

Now everyone is different. I'm a 68 y/o gym rat who still works with a trainer. And people with other replacements, or spinal fusion, should consult with an expert before getting into any of this.

Once scar tissue has formed, I'm not sure it can be totally removed or broken up. So I'm sorry if this advice isn't very useful to you. All the best.