What is the most effective treatment for chronic lower back pain?

I’ve heard that physiotherapy can sometimes help people manage knee problems and delay surgery, but I’m curious about real experiences.

Has anyone here with knee osteoarthritis or long-term knee pain tried physiotherapy before considering knee replacement?

What actually helped you. strengthening exercises, walking, weight management, manual therapy, or something else?

Would be interested to hear what worked for you and how long it took to notice a difference.