4 years ago, I injured my right knee in a workplace accident. After several surgeries and physio I was advised by my orthopedic surgeon that my right knee would need a total knee replacement but due to my age (early fifties). It was advisable to put off the surgery until I was older. Pain medication worked, so I was able to return to work and continue my duties. 9 months ago my left knee started becoming more and more painful and I was unable to perform my duties at work. I had however several months of sick leave saved, so after scans an arthroscopy cleanout of my left knee was scheduled and performed and I was off work for approx. 6 months. My arthroscopic surgeon advised that the injury to my left knee was probably because of over compensation to the injury on my right knee. I am ready to return to work. Have been cleared to return by my Orthopedic Surgeon and my GP but my employer now wants a Fitness-For-Duty Assessment performed by an Occupational Physician. I think this is a ploy to deny my return to my position and terminate my employment altogether. Can they do this? Any advice would be appreciated.