Common Knee Injuries and What You Should Know

Your knees handle a lot of force each day, from walking and stairs to sports and getting up from a chair. Because the knee has many moving parts and must stay stable, injuries can range from mild sprains to problems that make it hard to move normally.

Some knee problems show up right after a twist, fall, or awkward landing. Others develop slowly from overuse. When you understand common symptoms, you can recognize concerns early and know when it is time to get medical care.

Knee Injuries Patients Often Ask About

What You Should Know

Why Knee Injuries Are So Common

The knee is a complex joint made up of bones, ligaments, cartilage, tendons, and muscles. It needs strong support to carry your body weight and also needs smooth motion for bending, straightening, and turning.

This mix of stability and movement makes the knee vulnerable. A forceful twist, a direct hit, a sudden stop, or an awkward landing can overload one part of the joint and lead to injury.

A Quick Comparison of Common Knee Injuries

1. ACL Tears

The anterior cruciate ligament, or ACL, helps keep the knee stable, especially during cutting, pivoting, and sudden changes in direction. ACL tears are well known in sports, but they can also happen after a fall or an awkward twist.

Many people describe feeling or hearing a pop at the time of injury. Swelling often starts soon after, and the knee may feel unstable, like it could give way when you turn or try to change direction.

• Often caused by pivoting, landing, or sudden stopping
• May include a pop at the moment of injury
• Often followed by swelling and instability

2. Meniscus Tears

The meniscus is cartilage that acts like a cushion between the thighbone and shinbone. Each knee has two menisci, and they help with shock absorption and joint stability.

A meniscus tear can happen after a twist or deep squat, especially when the foot stays planted. In some people, the tissue can also wear down with age. Symptoms may include pain, swelling, stiffness, and a feeling that the knee catches or locks.

• Can happen with twisting or deep bending
• May cause catching, locking, or clicking
• Sometimes occurs from wear over time rather than a single injury

3. MCL Injuries

The medial collateral ligament, or MCL, runs along the inner side of the knee. It helps resist forces that push the knee inward.

MCL injuries often happen after a blow to the outside of the knee, which is common in contact sports. You may notice pain and tenderness on the inner side of the knee, along with swelling or a feeling that the knee is less stable than usual.

4. PCL Injuries

The posterior cruciate ligament, or PCL, sits behind the ACL and helps keep the shinbone from moving too far backward. PCL injuries are less common than ACL tears, but they can still cause significant symptoms.

These injuries often happen when the front of the bent knee strikes something hard, such as during a fall or motor vehicle collision. Pain, swelling, and a sense that the knee is not moving normally are common complaints.

5. Patellar Tendon Tears

The patellar tendon connects your kneecap to your shinbone and helps you straighten your knee. This tendon is important for walking, climbing stairs, standing up, and jumping.

A tear can happen when the tendon is overloaded, often during a forceful jump or landing. Pain is usually felt below the kneecap, and a more serious tear can make it very hard to straighten the leg or support your weight.

How Knee Injuries Are Diagnosed

A clinician will start with your history and a physical exam. How the injury happened, where the pain is located, whether the knee swelled right away, and whether the knee feels unstable can all help guide next steps.

Imaging may also be used. X-rays can help rule out fractures, while MRI is often used to look at soft tissues like ligaments, cartilage, and tendons.

Treatment Depends on the Injury

There is no single plan for every knee injury. Care is based on which structure is hurt, how severe the damage is, your symptoms, and what you want to return to in daily life or sports.

• Rest and activity changes may help protect the knee early on
• Bracing can help support the knee for some ligament injuries
• Physical therapy can work on strength, motion, and stability
• Some problems may need surgery, especially if there is a suspected complete tendon rupture, major ligament injury, a fracture, or a locked knee

When to See an Orthopaedic Specialist

Get checked soon if your knee pain is severe, if you heard or felt a pop, or if the joint swells quickly after an injury. It also matters if the knee feels like it will give out, gets stuck, or keeps you from walking normally.

A timely evaluation can help prevent additional damage and may help you start the right treatment sooner. If the cause of your symptoms is not clear, a specialist can help you sort out what might be injured and what to do next.

Getting Back to Daily Life Safely

A knee injury affects more than sports. It can change work tasks, sleep, exercise routines, and confidence walking on uneven ground or using stairs.

With an accurate diagnosis and a treatment plan that fits your needs, many people can return to their usual activities safely. Focus on healing and guidance, rather than pushing through pain.

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This blog post is meant to be informative and should not act as a self-diagnosis tool. If you’d like to see one of our doctors, please contact us here.