I am due to have surgery for a torn meniscus but now I am also experiencing pain in the “good” knee. I am using a walking stick but it is definitely affecting the quality of my life. I need advice.

I am sorry to hear about this issue. Obviously, I couldn't say for sure what's causing your pain, though it sounds like it might be to do with the way you are holding your body after the injury to your knee. You see, it's hard to avoid using weight-bearing joints like our knees so, if the area is painful, we often subconsciously change our posture to avoid putting pressure on the uncomfortable area. This can skew our musculature and can add to the problem or, in your case, it may cause issues to crop up elsewhere. A good osteopath should set this right so I would definitely recommend you see if you can get an appointment.