The knee is complex and susceptible to many types of injuries—especially in athletes. The body's largest joint, the knee can receive fractures, sprains, tears, dislocations, and other injuries if athletes do not engage in proper form and technique or do not wear the correct equipment for their sport. Knowing what knee injuries you are at risk for in your sport of choice is an important part of protecting yourself.
Meniscal tears are most commonly caused by a traumatic injury or sports injury, such as an unnatural over-rotation.

Knee sprains cause knee pain and swelling, and sometimes bruising. It can be difficult to put weight on the affected knee and may be difficult to walk.

Diagnosing a kneecap dislocation includes taking a thorough patient history, a physical exam, and medical imaging.
Diagnosing a LCL will require a visit to a health care professional. A person should be prepared to answer questions about the injury and their medical history, undergo a physical exam, and have medical imaging performed.
Diagnosing an MCL sprain or tear may include a patient interview, physical examination, and diagnostic imaging to determine the location and severity of the injury.
The diagnostic process for meniscal tears is first determine if a tear has occurred, then to figure out which is torn, how severely, and what treatment is appropriate.
Diagnosing a posterior cruciate ligament (PCL) tear requires a visit to a health care professional. A physician will conduct a patient interview, physical exam, and order medical imaging if necessary.

To diagnose runner’s knee (patellofemoral pain syndrome) a doctor must rule out other conditions that can cause knee pain. Learn how doctors use patient history, clinical examination, and medical imaging to diagnose runner’s knee.