Well I have just been in for what I thought was going to be a knee replacement. However they decided to do an arthroscopy which led them to carrying out a partial medial menisectomy and implantation of trochlear hemiarthroplasty ( whatever that is). Now on my discharge summary he has put I have a grade 4 osteochondral lesion and he admitted to me the arthritis in my knee was worse than what he expected. So it begs the question why didn't he resolve all my issues and replace my knee as he was meant too? Is there anything I can do about this? Thanks for taking the time to read this.