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Prepatellar (Kneecap) Bursitis

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Medium shot of a patient wearing a textured black compression knee sleeve with a patella cutout, holding their knee with both hands to manage pain and support joint fullness associated with prepatellar bursitis inflammation.

last updated by Cory Calendine, MD, Orthopedic Surgeon, April, 2026

Are you experiencing excessive fluid and noticeable swelling directly in front of your kneecap? Prepatellar bursitis, also known as “housemaid’s knee” or “carpet layer’s knee,” is the painful inflammation of the fluid-filled sac (bursa) that cushions the joint. Frequently caused by repetitive kneeling, occupational pressure, or direct trauma, this condition causes significant knee fullness and tenderness. In this post, board-certified orthopaedic surgeon Dr. Cory Calendine clarifies the common causes, identifies the dangerous symptoms of infectious bursitis, and discusses effective treatment options ranging from conservative care like ice and rest to fluid aspiration.

A bursa is a small, fluid-filled sac located throughout the body, including around the hip, knee, hip, shoulder, and elbow. Bursa normally contain a small amount of fluid and sit between bones and soft tissues to cushion and enable low-friction movement.

Prepatellar bursitis is inflammation of the bursa (fluid-filled sac) in the front of the patella (kneecap). When the bursa becomes irritated and inflamed, it produces excessive fluid causing swelling, joint fullness, and pain in the knee joint.

Causes of Prepatellar Bursitis

Prepatellar bursitis is often triggered by repetitive external pressure from kneeling. Manual laborers including plumbers, roofers, carpet layers, coal miners, and agriculture workers are at higher risk for developing the condition.

Prepatellar bursitis can also be caused by a direct blow to the front of the knee joint, putting many athletes at greater risk for the condition.

Additionally, some patients with preexisting inflammatory diseases (including rheumatoid arthritis and gout) are predisposed to prepatellar bursitis.

Patient with prepatellar bursitis showing characteristic fluid-filled swelling and fullness directly in front of the kneecap
The hallmark sign of prepatellar bursitis: a well-defined, fluid-filled swelling localized directly over the kneecap.

Less commonly, prepatellar bursitis can be caused by a bacterial infection of the bursa. Knee injuries which cause a break in the skin (cut, insect bite, puncture wound) can allow bacteria to invade the fluid-filled bursa in front of the kneecap. This condition is called infectious prepatellar bursitis and is a more serious condition, often requiring more emergent treatment.

Symptoms of Prepatellar Bursitis

  • Pain with knee joint movement (less commonly at night)
  • Rapid swelling just in front of the kneecap
  • Tenderness and warmth to touch of the kneecap

[Bursitis caused by infection can produce joint redness and systemic fever and chills]

Diagnosis and Treatment of Prepatellar Bursitis

  • X-rays: provide clear pictures of bone and soft tissue and assist to rule-out other causes of anterior knee pain and swelling
  • Other Imaging:  computerized tomography (CT) and magnetic resonance imaging (MRI) scans may be ordered (less commonly) to provide a more detailed view of the joint and soft tissue
  • Aspiration: Withdrawing excess fluid from the bursa can be both diagnostic and therapeutic. If recommended, Dr. Calendine can complete aspiration of the bursa fluid at your office visit. While draining fluid can reduce pressure on the joint, the fluid can be sent for laboratory analysis to help rule out joint infection.

Conservative (nonsurgical) Treatment

  • Avoid the activities that apply pressure to the knee joint (while still remaining active).
  • Apply ice at regular intervals 3 or 4 times a day for 20 minutes at a time to reduce swelling
  • Elevate the affected leg except when possible to help limit swelling.
  • Nonsteroidal anti-inflammatory drugs (NSAIDs) medications (such as naproxen and ibuprofen) may be recommended to help relieve pain and control inflammation.

Aspiration of Fluid

If the swelling and pain do not improve with more conservative measures, Dr. Calendine may choose to drain (aspirate) the bursa with a needle and sometimes then inject the bursa with a corticosteroid (to limit further inflammation). Bursa aspiration can be completed in the outpatient office with minimal discomfort.

Two 50 mL syringes containing blood-tinged fluid aspirated from an inflamed prepatellar bursa during an in-office knee drainage procedure
Nearly 100 mL of blood-tinged fluid drained from an inflamed prepatellar bursa — in-office aspiration relieves pressure and can be sent for lab analysis to rule out infection.

Infectious Prepatellar Bursa

Infectious bursitis is more dangerous condition and requires is initial treatment with antibiotics. Surgical drainage may be required if the infection does not respond to antibiotics alone.

More information about Infectious Prepatellar Bursitis from AAOS CLICK HERE

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FREQUENTLY ASKED QUESTIONS

Common Questions From Readers

What is prepatellar bursitis?
Prepatellar bursitis is the inflammation of the prepatellar bursa, which is a small, fluid-filled sac located directly in front of the kneecap (patella). This bursa normally allows the skin to slide smoothly over the kneecap. When irritated by repetitive pressure, trauma, or underlying conditions, it produces excess fluid, leading to visible swelling, fullness, and pain superficial to the joint.
Prepatellar bursitis causes distinct swelling specifically in the soft tissue in front of the kneecap, often described as a water balloon on the knee. While it is tender, the pain is usually less intense than a fracture or major ligament tear unless it is infected. Dr. Calendine often uses X-rays or advanced imaging like MRI or CT scans to definitively rule out bone fractures or joint damage as the cause of the anterior knee pain and swelling.
Manual laborers who spend extended time kneeling—such as carpet layers, plumbers, roofers, coal miners, and agriculture workers—are at the highest risk for developing this chronic condition. Athletes who sustain direct blows to the front of the knee in contact sports (like football or wrestling) are also at higher risk, along with individuals with existing inflammatory conditions like rheumatoid arthritis or gout.
Most cases resolve with conservative, nonsurgical treatment focused on reducing inflammation. Effective measures include avoiding activities that apply pressure to the knee, applying ice at regular intervals, elevating the leg to limit swelling, and using nonsteroidal anti-inflammatory drugs (NSAIDs) like naproxen or ibuprofen. If swelling persists, Dr. Calendine may perform bursa aspiration in the office to drain the excess fluid.
Prepatellar bursitis can sometimes be caused by a bacterial infection, often through a break in the skin from a cut or insect bite. If the swelling is accompanied by intense redness, warmth to the touch, and systemic symptoms like fever or chills, this indicates infectious prepatellar bursitis. This is a serious condition that requires immediate treatment with antibiotics and potentially surgical drainage.
Dr. Cory Calendine, MD, board-certified orthopedic surgeon specializing in hip and knee replacement at the Bone and Joint Institute of Tennessee in Franklin, TN, shown in a gray suit with glasses and a blue tie during a professional portrait session.

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About Cory Calendine, MD

Dr. Cory Calendine is a board-certified, fellowship-trained orthopedic surgeon specializing in hip and knee replacement at the Bone and Joint Institute of Tennessee in Franklin, TN. He performs more than 700 hip and knee replacement procedures annually and serves as a consultant to Stryker for the Mako® robotic platform.

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