The second possibility: the knee plays a key role in our daily exercise, such as regulation, control and buffering. In your dream, I feel that it may represent your behavior control in daily life, and your interest and preference in the Internet may be out of control in the near future, which may have an impact on your daily life, study and body.
Our dreams are sometimes a pun. A dream reflects two or even three kinds of realistic behaviors and psychological consciousness. As for which one to map to, seriously reflect on your recent behavior, which needs to be corrected and which needs to be adjusted, and then compare it with the dream, and it will suddenly become clear.