It's very cold, and my knee hurts. It doesn't hurt when it is warm. What happened?

Soft tissue contusion, because the weather is cold, the recovery is very slow. Recovery has a lot to do with the weather. If the weather is warm, it will be fine in a month or two. You are chronic because of the cold weather. Keep warm, and you will get better gradually. The wear of knee joint is inevitable, but it can be slowed down. The knee joint is always in a cycle of wear and repair. If the wear is faster than the repair speed, people will be injured and feel pain. Therefore, rest and recovery are very important. After a lot of exercise, ice should be applied to slow down the degree of edema and accelerate the recovery process.