Behind-the-knee pain could be due to muscle strain or arthritis—or something far more serious. Orthopedic experts say these ...

An injury or arthritis most likely causes pain outside the knee. A doctor can determine the cause based on your other symptoms and the results of imaging tests. Pain on the outer (or lateral ...

ACL (anterior cruciate ligament) injuries are a big problem, especially for athletes who jump, pivot, and change direction quickly. Female athletes are more likely to suffer from ACL injuries.

Some individuals who have had anterior-cruciate-ligament reconstruction (ACLR), the kind of surgery often performed on athletes' knees, may develop early-onset knee osteoarthritis. A new study in the ...

The vastus medialis, otherwise known as the vastus medialis oblique (VMO), is a teardrop-shaped muscle in the front of your thigh that helps extend the knee and stabilize the kneecap. It is one of the ...

Os trigonum syndrome is a painful condition that can affect people who have an extra bone at the back of the ankle, called an os trigonum. The extra bone is present in 15% to 30% of people and doesn't ...