Prepatellar Bursitis

Have you noticed an unusual lump or swelling over your kneecap, particularly after kneeling or injuring your knee?

Perhaps you've been gardening, working around the house or spending time on your knees, only to discover that the front of your knee has become swollen and tender. Even simple activities such as kneeling to clean the floor, getting down to play with the grandchildren or bending your knee can suddenly become uncomfortable.

If you've been diagnosed with prepatellar bursitis, you'll know how frustrating this swelling and discomfort can be. Prepatellar bursitis occurs when a small fluid-filled sac located directly over your kneecap becomes irritated or inflamed. It commonly develops through repetitive kneeling, prolonged pressure or a direct injury to the knee.

The good news is that many cases improve without surgery. Understanding what's causing the swelling, which activities may be aggravating it and what treatment options are available can help you take the right steps towards recovery.

What Is Prepatellar Bursitis?

Your knee contains several small fluid-filled sacs called bursae, which provide cushioning and help reduce friction between bones, tendons and surrounding tissues.

One of these is the prepatellar bursa, located directly between the skin and the front of your kneecap, known as the patella. Its role is to cushion the kneecap and allow the overlying skin and soft tissues to move smoothly.

When this bursa becomes irritated or inflamed, it may produce excess fluid, causing swelling and tenderness over the front of your knee. This condition is known as prepatellar bursitis, sometimes referred to as housemaid's knee, a traditional name associated with people who spent long periods kneeling while cleaning floors.

Because the bursa sits close to the skin's surface, inflammation can produce a very noticeable lump. In some cases, the swelling may appear quite large, even when the pain itself is relatively mild. [1]

For a broader explanation of the different types of bursitis affecting the knee, visit our Knee Bursitis Information page.

What Are the Symptoms of Prepatellar Bursitis?

One of the more noticeable features of prepatellar bursitis is the swelling that develops directly over the kneecap. You may notice that one knee looks considerably larger than the other, or that a soft lump has appeared after spending time kneeling.

Common symptoms include:

• Swelling over the kneecap: A noticeable lump or fluid-filled swelling at the front of the knee.
• Pain when kneeling: Direct pressure on the affected area may cause significant discomfort.
• Tenderness to touch: The swollen area may feel sensitive when pressed or bumped.
• Knee stiffness: Swelling can make bending the knee uncomfortable or restrict certain movements.
• Discomfort during activity: Walking, climbing stairs or exercising may become uncomfortable, particularly when swelling is more pronounced.
• Warmth around the knee: The affected area may feel warmer than the surrounding skin.

Symptoms can develop gradually following repeated kneeling or appear quite suddenly after a fall or direct impact. It's worth remembering that a swollen kneecap doesn't always mean there's damage inside the knee joint itself.

With prepatellar bursitis, the fluid generally accumulates within the bursa in front of the kneecap rather than inside the joint. However, a hot, red or increasingly painful knee can indicate infection and should be assessed promptly.

What Causes Prepatellar Bursitis?

Prepatellar bursitis most commonly develops when the bursa is subjected to repeated pressure or direct injury.

Several factors may contribute.

Frequent or Prolonged Kneeling: Gardening, cleaning, laying flooring, plumbing and other activities that involve kneeling on hard surfaces can place repeated pressure on the bursa.

Direct Injury or Impact: Falling onto your knee or knocking the kneecap against a hard object may trigger swelling and inflammation.

Sports and Recreational Activities: Activities involving frequent falls, direct knee contact or prolonged kneeling may contribute to irritation.

Underlying Medical Conditions: Certain inflammatory conditions, including gout and rheumatoid arthritis, may increase susceptibility to bursitis.

Infection: Occasionally, bacteria can enter the bursa through a cut, scratch or other break in the skin. This is known as septic prepatellar bursitis and requires prompt medical treatment, usually involving antibiotics. It should not be managed as an ordinary non-infected bursitis flare-up. [2]

Why Can the Swelling Over Your Kneecap Be So Persistent?

One of the frustrating things about prepatellar bursitis is that the swelling doesn't always disappear as quickly as you'd expect.

You may find that your knee feels less painful after a few days of rest, yet the fluid-filled lump remains noticeable. This happens because the inflamed bursa can continue holding excess fluid even after some of the initial irritation has settled. And because the bursa sits directly over your kneecap, everyday activities can easily place pressure on it.

For example, you might begin feeling better and return to gardening or another activity involving kneeling, only to find that the swelling becomes aggravated again.

The challenge is allowing the bursa enough time to settle while avoiding the activities that repeatedly place pressure on it. Persistent or recurrent swelling should be assessed to confirm its cause, rather than assuming that every lump over the knee is bursitis.

Prepatellar Bursitis vs Infrapatellar Bursitis – What's the Difference?

Although both conditions affect the front of the knee, they involve different bursae.

Prepatellar bursitis affects the bursa directly over the kneecap and commonly produces visible swelling in front of the patella.

Infrapatellar bursitis affects a bursa located below the kneecap, closer to the patellar tendon and upper shinbone.

Both conditions may develop through repetitive kneeling, pressure or direct injury. However, the location of the swelling and tenderness can provide useful clues about which bursa is affected.

For more information about pain and swelling below the kneecap, read our Infrapatellar Bursitis article, which is part of our broader knee bursitis information.

How Is Prepatellar Bursitis Diagnosed?

If you've developed a persistent lump or swelling over your kneecap, it's worth having the condition properly assessed.

A healthcare professional will generally begin by discussing your symptoms, recent injuries and whether your work or recreational activities involve frequent kneeling. They may examine the swollen area, check for tenderness and assess your knee movement.

In many cases, a physical examination provides sufficient information to make an initial diagnosis. However, further investigations may sometimes be recommended.

Ultrasound: An ultrasound can help identify fluid within the bursa and distinguish bursitis from certain other soft-tissue problems.

X-rays: Although X-rays don't directly show inflammation within the bursa, they may help identify fractures or other bone-related problems following an injury.

Fluid Aspiration: If an infection is suspected, a healthcare professional may recommend taking a sample of fluid from the bursa for testing.

Not everyone with prepatellar bursitis requires imaging or drainage. The most appropriate investigations depend on the symptoms and clinical examination. [1]

What Are the Treatment Options for Prepatellar Bursitis?

If you're dealing with a swollen or painful kneecap, your first priority is understandably to find some relief.

Treatment generally focuses on reducing pressure on the affected bursa, managing swelling and allowing the inflammation to settle. Importantly, treatment for an infected bursa is different and requires medical attention.

1. Rest and Activity Modification

Temporarily avoiding activities that aggravate your knee is often the most important first step.

In particular, try to avoid kneeling directly on the affected kneecap. If your work or hobbies involve frequent kneeling, you may need to modify those activities while the inflammation settles. However, prolonged complete inactivity isn't generally necessary.

Gentle walking and comfortable movement can often be maintained, provided they don't significantly aggravate your symptoms. The aim is to reduce unnecessary pressure without allowing your knee to become stiff or weak.

2. Heat and Cold Therapy

Cold therapy is commonly recommended for a recently irritated or swollen prepatellar bursa. Applying a cold pack wrapped in a towel for approximately 10–20 minutes may help manage pain and swelling.

For longer-standing stiffness or muscle tension around the knee, gentle warmth may sometimes provide additional comfort. However, heat is not generally recommended over an actively swollen, hot or red knee, particularly when infection is possible.

3. Knee Protection and Support

If your work or everyday activities involve kneeling, suitable knee protection can make a difference.

Cushioned kneepads may help distribute pressure and reduce repeated irritation once you're ready to return to these activities. However, protective equipment shouldn't be used as a reason to continue kneeling on a painful or significantly swollen bursa. Avoid tight supports or kneepads that press directly onto the swollen area.

4. Physiotherapy and Rehabilitation

During the initial stages of painful prepatellar bursitis, exercises that repeatedly place pressure on the inflamed bursa should generally be avoided or modified. Gentle knee movement can often be maintained, provided it doesn't significantly aggravate the condition.

As the inflammation and associated pain settle, physiotherapy may help restore normal knee movement, rebuild muscle strength and address weakness that has developed through reduced activity.

The timing and intensity of rehabilitation should be appropriate to your recovery.

5. Medication and Medical Treatments

Pain-relieving or anti-inflammatory medication may help manage discomfort, although these treatments aren't suitable for everyone.

In selected cases, a healthcare professional may consider draining excess fluid from the bursa, particularly when swelling is persistent or the diagnosis is uncertain. However, drainage isn't always necessary and carries risks, including infection.

Corticosteroid injections may occasionally be considered for non-infected bursitis, although they require careful assessment. Surgery is rarely required and is generally reserved for persistent or recurrent cases that haven't responded to appropriate treatment.

If the bursa is infected, antibiotics and sometimes medical drainage may be necessary. [3]

6. Drug-Free, Non-Invasive Knee Bursitis Relief with OSMO Patch

If you're looking for a drug-free, non-invasive way to help manage the swelling and associated pain from knee bursitis, the OSMO Patch offers a convenient home treatment option.

Simply apply the patch over the affected area before going to bed and let it work while you sleep.

Designed to help reduce swelling and associated discomfort, OSMO Patch may ofers an ideal drug-free, non-invasive treatment option alongside appropriate rest and activity modification.

Discover how OSMO Patch may help you manage knee bursitis swelling and associated pain — so you can get back to enjoying your everyday activities.

>> Learn More About OSMO Patch for Knee Bursitis Relief →

(OSMO Patch is not suitable for individuals with seafood or shellfish allergies)

How Long Does Prepatellar Bursitis Take to Heal?

Recovery times vary depending on the severity of the inflammation, how long the swelling has been present and whether the bursa continues to be irritated.

Some uncomplicated cases improve over several weeks with appropriate rest and activity modification. However, the swelling can sometimes persist longer, particularly when repeated kneeling or pressure continues to aggravate the area.

One important point is that your knee may become less painful before the swelling has completely disappeared.

Returning too quickly to activities that place direct pressure on the kneecap can sometimes trigger another flare-up. Allowing sufficient recovery time and gradually returning to normal activities may help reduce the likelihood of recurring symptoms.

 

Frequently Asked Questions About Prepatellar Bursitis

Why Has a Soft Lump Suddenly Appeared Over My Kneecap?

A soft lump over the kneecap may be caused by fluid accumulating within the prepatellar bursa.

This can happen following repeated kneeling or a direct knock to the knee.

However, not every lump around the kneecap is bursitis. A new, enlarging or persistent swelling should be examined by a healthcare professional.

Why Is My Kneecap So Swollen When It Doesn't Hurt That Much?

Prepatellar bursitis can sometimes produce considerable swelling without severe pain.

Because the bursa sits just beneath the skin, even a moderate amount of excess fluid may create a noticeable lump.

However, the amount of swelling doesn't necessarily indicate how serious the underlying cause is. It's important to have unusual swelling properly assessed.

Can I Still Walk with Prepatellar Bursitis?

In many cases, gentle walking is possible if it doesn't significantly aggravate your symptoms.

You may find that walking is relatively comfortable while kneeling or placing direct pressure on the kneecap is particularly painful.

However, if walking causes significant pain, swelling increases or you're struggling to bear weight, seek medical advice.

Should I Have the Fluid Drained from My Swollen Kneecap?

Not necessarily.

Many cases improve without drainage once pressure on the affected bursa is reduced.

A healthcare professional may recommend draining fluid if an infection is suspected, the swelling is particularly troublesome or further testing is required.

Never attempt to drain or puncture the swelling yourself, as this can introduce infection.

Why Isn't the Swelling Over My Kneecap Going Away?

Persistent swelling may occur when the bursa continues to be irritated through kneeling, repeated pressure or physical activity.

Sometimes the swelling remains even after the initial pain has improved.

If the lump isn't getting smaller, keeps returning or becomes increasingly painful, it's important to have the condition reassessed.

How Do I Know If My Prepatellar Bursitis Is Infected?

An infected bursa may cause increasing redness, warmth, tenderness and swelling around the kneecap.

You may also develop a fever, chills or feel generally unwell, although infection can sometimes occur without a fever.

If your knee becomes unusually hot, red or increasingly painful, seek prompt medical assessment rather than attempting further home treatment.

When Should You Seek Medical Attention?

If swelling over your kneecap persists, worsens or significantly interferes with everyday activities, consult a qualified healthcare professional.

Seek urgent medical attention if the knee becomes hot, red or rapidly more swollen, particularly if you develop a fever or feel unwell.

Severe pain following an injury, an inability to bear weight or marked difficulty moving the knee also warrants prompt assessment.

Medical References

[1] American Academy of Orthopaedic Surgeons (AAOS): Prepatellar (Kneecap) Bursitis. Read the AAOS medical resource

[2] Leeds Community Healthcare NHS Trust: Pre-patella Bursitis – Symptoms, Causes and Treatment. Read the NHS medical guidance

[3] Cleveland Clinic: Prepatellar Bursitis – Symptoms, Causes and Treatment. Read Cleveland Clinic's medical guidance