Infrapatellar bursitis of the knee

The bursa is a small fluid-filled cushion between moving tissues. Repetitive pressure, friction, a blow or infection can inflame it, producing a tender area or visible swelling at the front of the knee.

Pain is usually focused just below the kneecap rather than deep inside the joint. You may notice sensitivity when kneeling, a lump that rubs against clothing, warmth or discomfort when the knee is pressed. The knee can sometimes bend and straighten more easily than expected because the main joint surfaces are not necessarily the source. An examination helps separate bursal inflammation from patellar tendon pain, joint swelling or a skin infection.

Temporarily avoid kneeling, crawling and exercises that press on the front of the knee. A padded surface can reduce pressure when work requires kneeling. Keep the knee gently mobile within comfort and return to activity gradually as tenderness improves. A pharmacist or clinician can advise whether anti-inflammatory medication is appropriate with your health history. Persistent fluid may lead to discussion of aspiration or an injection, but these procedures require a proper examination first.

Get medical advice when the swelling lasts, recurs, interferes with work or follows a significant impact. Seek urgent assessment for spreading redness, marked warmth, pus, fever, rapidly worsening pain or difficulty bearing weight. These features may indicate infection or another knee problem requiring treatment rather than pressure relief alone.

Ask which structure is swollen, whether you can continue work or sport with modifications, how to protect the knee while kneeling, and whether fluid testing is needed before any procedure.