Limb Preservation System

I had a knee replacement that utilized the Limb Preservation System in February. I'm struggling to bend my knee and I'm not much better off than before except that my extremes soft bones were replaced. My range of motion is still terrible even with rigorous PT. I can only get to about 25-45 flexion on my own. My kneecap doesn't move and I was looking for help from my previous sports med surgeon to remove scar tissue but the surgeon who did my replacement surgery scared him off from it. I don't know what to do to get my leg bending. I'm nervous about the job my MD did after reading some bad reviews about his honesty around making mistakes. I want to get another opinion but I'm just also looking for guidance if anyone else has had this type of surgery and follow up issues. I'm happy to give more of my history if anyone in interested or possibly has any advice.