What does tibio-femoral and patellofemoral joint spaces are preserved mean?

The tibio-femoral and patellofemoral joint spaces are the gaps between the bones that make up the knee joint. They are filled with a fluid that helps to lubricate the joint and reduce friction. When these joint spaces are preserved, it means that there is no significant narrowing or damage to the cartilage that lines the bones. This is an important indicator of knee health, as narrowing of the joint spaces can be a sign of osteoarthritis or other degenerative joint diseases.