You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is What structure contributes to the knee joint? and explain in detail?
The upper surface of the right tibia. (Anterior is at the top.) The medial condyle is the medial portion of the upper extremity of the tibia. It is the site of insertion for the Semimembranosus muscle.