Common Causes of Knee Pain and When to Get Care

An injury can cause knee pain to appear all at once, or it may be the result of an underlying condition and general wear and tear that has set in over time. Given the complexity of the joint and its role in everything from walking and climbing stairs to bending and general activity, such discomfort is bound to have an impact on day to day living.

While a course of rest, some modification of one’s activities and rehabilitation will see to it that certain knee issues are resolved, there are cases that call for timely medical intervention. This is particularly true when one is dealing with recurrent pain, swelling, an inability to put weight on the leg or a sense of instability.

To get the proper treatment and make a safe return to being active, it is important first to have an understanding of what might be behind the symptoms.

Important Points About Knee Pain

Why Knee Pain Is So Common

As one of the body’s largest joints, the knee is put to work on a daily basis and must take on considerable force. For it to function without issue, it depends on an interplay of bones, cartilage, ligaments, tendons, muscles and bursae, or cushioning sacs.

Should any of those components become overloaded, inflamed, injured or simply worn out, pain is the result. One can often discern the source of the problem from where the pain is felt, the manner in which it came on and what kind of activity tends to aggravate it.

How Doctors Think About Knee Pain

One way to categorise knee pain is by its location and whether it came on as a result of an injury or in a more gradual fashion. Take front-of-knee pain, for instance; that can be indicative of patellofemoral issues. Then there is the matter of pain along the joint line which might give one cause for concern regarding a meniscus tear or arthritis.

The nature of the symptoms also tells you something. A case of swelling setting in right after an injury is likely to mean there is some damage within the joint. On the other hand, if the pain has been getting worse over the course of several months, it is more in keeping with what one would expect from overuse, degeneration or arthritis.

Frequent Causes of Knee Pain

There are many possible reasons for knee pain. Some are related to sports and trauma, while others are tied to wear and tear, biomechanics, or inflammation.

Injuries That Can Trigger Sudden Knee Pain

Acute knee pain often starts after a specific event. A fall, collision, twist, awkward landing, or sudden stop can injure soft tissue or bone in and around the knee.

• Ligament injuries: These include injuries to the ACL, PCL, MCL, and LCL. They may cause a pop, rapid swelling, or a feeling of knee instability.
• Meniscus tears: The meniscus is a C-shaped piece of cartilage that helps cushion the joint. A tear can happen with twisting and may cause pain, swelling, or locking.
• Tendon injuries: Tendons connect muscle to bone. Sudden force can strain or tear them, leading to pain and weakness.
• Fractures: A direct blow or fall can lead to a broken kneecap or fracture of the bones around the joint.

Conditions That Cause Knee Pain Over Time

Not all knee pain starts with an injury. In many cases, symptoms develop gradually due to repetitive stress, joint aging, muscle imbalances, or inflammation.

• Osteoarthritis: This is one of the most common causes of chronic knee pain. It happens when joint cartilage wears down, often leading to aching, stiffness, and swelling.
• Patellofemoral pain syndrome: This refers to pain around or behind the kneecap. It can be linked to overuse, muscle imbalance, alignment issues, or cartilage irritation.
• Tendinitis: Repeated strain can irritate the patellar tendon or quadriceps tendon, especially in people who jump, run, kneel, or climb often.
• Bursitis: Kneeling for long periods or repeated pressure on the front of the knee can inflame a bursa and cause visible swelling and soreness.
• Iliotibial band-related pain: Irritation along the outer side of the knee may develop with repetitive movement, especially in runners and cyclists.

What the Symptoms May Feel Like

Knee pain can feel very different depending on the cause. The symptoms may be sharp or dull, constant or only present during certain activities.

• Aching or stiffness, especially in the morning or after sitting
• Swelling around the joint
• Pain with stairs, squatting, kneeling, or getting up from a chair
• Clicking, catching, or locking
• A sense that the knee may buckle or give way
• Tenderness in one small area or pain deep inside the knee
• Difficulty fully straightening or bending the knee

When an injury is accompanied by marked swelling, a deformity that can be seen, or the knee is hot or red and swollen, it is best to opt for an urgent or emergency medical assessment over routine care. The same applies if one has a fever or cannot put weight on the leg. In particular, a very swollen, hot and red knee in the presence of fever or general malaise may be a sign of infection and warrants immediate evaluation.

How Knee Pain Is Diagnosed

We typically start a comprehensive evaluation by having you tell us your story. It is important for us to understand the nature of the pain, its location and what movements aggravate or relieve it, as well as when it first set in and if an injury was involved.

From there the physical exam will cover such things as strength, alignment and joint stability, not to mention any swelling or tenderness and how much range of motion is present. In some cases, should the symptoms warrant it, we will put you down for an X-ray or MRI to get a better view of the bone, cartilage or soft tissue.

Treatment Options for Knee Pain

Treatment depends on the cause of your knee pain, its severity, and how much it affects your daily life. Many patients improve with non-surgical care, especially when treatment starts early.

Non-Surgical Care Often Starts Here

• Reduce or pause activities that clearly worsen the pain
• Use ice after activity if swelling is present
• Begin guided exercises to restore motion and support around the knee
• Address hip, core, and leg strength if mechanics are contributing
• Consider footwear, surfaces, training load, and work demands

When Knee Surgery May Be Considered

There are instances where conservative measures are not enough to bring about an improvement in certain knee conditions. In such cases, one might be advised to have surgery. This is typically the course of action when faced with severe arthritis, marked structural damage or instability, and pain that is persistent enough to take a toll on one’s quality of life.

As for the procedure itself, what is called for will hinge on the diagnosis. Options can be as varied as arthroscopic work or a full joint replacement for advanced arthritis, up to ligament reconstruction. The objective is to put together a care plan that is suited to the condition at hand as well as your own activity level.

When You Should See a Knee Specialist

You should schedule an evaluation if your knee pain is severe, keeps returning, or affects your ability to move normally. Even if symptoms seem manageable at first, ongoing pain can lead to compensation and additional strain elsewhere.

• Pain lasts more than several days or continues to worsen
• You notice swelling, warmth, or reduced range of motion
• Your knee feels unstable, locks, or gives way
• You cannot return to exercise, work, or daily activity comfortably
• You have trouble bearing weight after an injury

Getting Back to Comfortable Movement

There is no denying that knee pain has a way of getting in the way of everyday activities, be it walking or exercising, and can affect one’s work, sleep and general confidence when on the move. Fortunately, with proper evaluation and a sound care plan, the underlying causes of such pain are often amenable to effective treatment.

Should the symptoms fail to abate, an exam is in order to get to the bottom of what is behind the knee 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.