There are several types of knee injuries that can occur from traumatic accidents. Here are some of the most common:

1. ACL tear: The anterior cruciate ligament (ACL) is one of the four main ligaments that stabilize the knee joint. An ACL tear is a common knee injury that occurs when the ACL is stretched or torn. This can happen during sports, such as football or basketball, or from a fall or other traumatic accident.

2. Meniscus tear: The meniscus is a piece of cartilage that provides cushioning and support to the knee joint. A meniscus tear is a common knee injury that can occur from twisting or rotating the knee during a traumatic accident.

3. Patellar dislocation: The patella, or kneecap, can sometimes become dislocated from its normal position, causing pain and instability in the knee joint. This can happen from a direct blow to the knee or from a sudden twisting motion.

4. Fractures: The bones in the knee, including the femur, tibia, and fibula, can sometimes be fractured or broken during a traumatic accident. This can cause severe pain, swelling, and difficulty moving the knee.

5. PCL tear: The posterior cruciate ligament (PCL) is another ligament that stabilizes the knee joint. A PCL tear can occur from a direct blow to the front of the knee, such as during a car accident.

6. LCL tear: The lateral collateral ligament (LCL) is located on the outside of the knee joint and helps to stabilize it. An LCL tear can occur from a blow to the inside of the knee, causing the knee to buckle outward.

Treatment for knee injuries will depend on the type and severity of the injury. Some injuries may require surgery, while others can be treated with rest, ice, compression, and physical therapy. It is important to seek medical attention if you experience a knee injury, as some injuries can cause long-term complications if not treated properly.