This part of the TOTBID Journal Total Knee Arthroplasty Issue includes sample cases regarding disputes related to knee diseases and their treatments, and the cases have been evaluated from a medicolegal perspective to contribute to comprehension of our colleagues. It should not noted that the way to understand a special field, such as health law, requires general information about law. Discussing health law, a higher specialization subject, with our colleagues, who do not have a basic legal background, will not be beneficial, and it will cause the information to be misinterpreted and internalized in a wrong way. In this respect, it would be beneficial to perceive the discussions regarding the sample cases in this issue as an annex to the content of the TOTBID Journal 2020/1 issue, which includes basic legal knowledge. The case studies were simplified and presented with their essence, without analyzing each case individually, and an analysis was made for the whole and to serve the inferences, and discussed in a separate section under the title of `discussion`.