Knee Bumps: Causes and When to Seek Medical Advice - Orthopedics

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Knee bumps, or any protrusions around the knee joint, can be concerning and may arise from various causes. Understanding these causes is essential for determining whether medical advice is needed.
One common cause of bumps on the knee is bursitis, which is inflammation of the bursa, a small fluid-filled sac that acts as a cushion between bones and soft tissues. The knee has several bursae, and when they become inflamed, they can lead to swelling and tenderness. This condition often results from repetitive activities or direct trauma to the knee, such as frequent kneeling or falling, which aligns with what your doctor mentioned about frequent impacts.

Another potential cause is osteophytes, or bone spurs, which can develop due to osteoarthritis. As cartilage wears down over time, the body may respond by forming new bone in an attempt to stabilize the joint. These spurs can create a noticeable bump and may be accompanied by pain, especially during movement.

Cysts, such as a Baker's cyst, can also present as a bump behind the knee. This type of cyst forms when excess joint fluid accumulates in the popliteal bursa, often due to underlying knee issues like arthritis or meniscus tears. While Baker's cysts are generally benign, they can cause discomfort and limit mobility.

In some cases, ligament injuries or tendonitis can lead to swelling and the formation of bumps. For instance, patellar tendonitis (jumper's knee) can cause swelling at the knee's front, where the tendon attaches to the kneecap. Similarly, injuries to the collateral ligaments can lead to localized swelling.

If the bump is associated with pain, redness, warmth, or limited range of motion, it is advisable to seek medical attention. Additionally, if the bump persists, grows, or changes in appearance, further evaluation is warranted. Diagnostic imaging, such as X-rays or MRI, may be necessary to determine the underlying cause accurately.

In summary, while minor bumps on the knee may not always indicate a serious problem, they can be symptomatic of various conditions ranging from benign to more serious issues. If you have concerns about the bump on your knee, especially if it is accompanied by other symptoms, it is essential to consult with a healthcare professional for a thorough evaluation and appropriate management. Regular follow-ups and monitoring can help ensure that any underlying issues are addressed promptly, allowing for better outcomes and improved knee health.