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What are a bursa and bursitis?
A bursa is a small pocket that helps tissues glide over one another. Several lie around the knee. The prepatellar bursa sits in front of the kneecap, close to the skin. It may become irritated, painful and swollen: this is called bursitis.
Superficial bursitis is different from fluid inside the joint, a Baker’s cyst behind the knee or patellar tendon pain. Location provides information but cannot distinguish them alone. Any new marked or unusual swelling deserves assessment.
Chapter sources [1]
Understand the picture
A small pocket in front of the kneecap
Skin
A wound may require special precautions.
Bursa
It helps tissues glide and can swell.
Kneecap
It lies deeper, at the front of the knee.
Chapter sources [1]
Which symptoms can it cause?
A lump or visible swelling may appear at the front of the knee. Pressure, contact with the floor or certain movements become uncomfortable. The area may be tender and warmer. Sometimes the swelling is more noticeable than the pain.
Increasing redness, warmth and pain require checking for infection, particularly after a wound. Fever increases concern, but its absence does not rule out infection. Do not wait for every sign before seeking advice when the situation is worsening.
What can cause irritation?
Kneeling work, gardening, some sports and repeated knocks can put pressure on a superficial bursa. A single fall onto the knee can also irritate it. Consider the task, its duration, the surface and opportunities to change position.
A wound or irritated skin can allow infection to enter. Other illnesses, including gout or some inflammatory diseases, can contribute to swelling. Recognising a repeated activity is therefore not enough to conclude that the problem is only mechanical.
Chapter sources [1]
When should you seek prompt assessment?
Seek advice the same day if the area becomes clearly red, hot or very painful, or redness spreads, especially with fever, chills or feeling unwell. Mention a wound, discharge, diabetes, reduced immune defences or treatment affecting infection risk.
Inability to move the knee or bear weight, very severe pain or worsening general health needs urgent assessment. In Luxembourg, call 112 in an emergency. Suspected bursitis should not be used as reassuring proof when a knee is changing rapidly.
What might the doctor investigate?
The doctor examines the skin, location of fluid, movement and associated signs. They aim to distinguish an irritated bursa, infection and another joint problem. Blood tests or imaging may help according to findings; not every test is needed in every case.
Sometimes aspiration of the bursa allows fluid analysis, particularly for infection or crystals. This is a professional procedure. Do not try to puncture the pocket at home, even with a supposedly clean needle: this can introduce infection.
Chapter sources [1]
How is bursitis without infection managed?
Treatment often begins by reducing direct pressure and tasks that irritate the area. Wrapped cold may provide comfort if skin, sensation and circulation allow. Any medicine should be discussed with a doctor or pharmacist according to your history.
An injection is not automatic and should not be performed when infection is suspected. Aspiration or, more rarely, surgery may be discussed for some persistent cases. The choice depends on cause, progress and impact, not only the pocket’s visible size.
What if infection is responsible?
Infected bursitis needs medical treatment, which may include antibiotics and sometimes drainage. The choice depends on severity and your health circumstances. Exercises, massage and compresses do not replace this treatment. Do not take leftover antibiotics without a prescription.
Follow review instructions and contact the team if redness spreads, pain increases or you feel worse. Partial improvement does not allow you to change treatment yourself. Returning to direct knee pressure should wait for appropriate instructions and skin protection.
In everyday life
Adapt a kneeling task
Remove painful pressure
Change working height or use suitable support.
Protect and observe
Check the skin, warmth and swelling over time.
Return in stages
Alternate positions and increase duration according to the response.
What is physiotherapy’s role?
Once the cause is clear, your physiotherapist may help you regain limited movement and activities. They may suggest task adaptations and strengthening if capacity has been lost. The aim is not to crush the bursa with massage or empty fluid through exercise.
The Exercises page contains general options that avoid direct kneeling. They still need selection according to your assessment. If a movement causes lasting swelling or irritates the skin, change it and seek advice. Suspected infection needs treatment before routine physiotherapy.
Chapter sources [1]
How can you adapt work, gardening and sleep?
Try working at another height, sitting on stable support or using a longer tool. If kneeling becomes possible again, suitable protection and breaks may reduce pressure. A knee pad should not squeeze a painful pocket or continue rubbing a wound.
In bed, avoid support that directly compresses the area and find a comfortable position. Clean and protect minor wounds according to usual skin-care advice. These are practical measures, but spreading redness or discharge needs medical advice.
What progress can you expect, and how can recurrence be limited?
Simple irritation may improve over a few weeks once pressure is reduced. A pocket can remain visible for a while. If it does not improve, often returns or causes increasing difficulty despite adaptations, the cause and provoking tasks need reassessment.
Do not wait weeks when infection signs are present. For return, gradually increase the duration of demanding activities and keep alternative positions available. Prevention relies on realistic work organisation, skin protection and review of recurrences, without promising that equipment prevents every new episode.
Your questions
Can I drain the pocket myself?
No. Aspiration must be decided on and performed by a professional. Puncturing the skin can cause infection and does not properly establish the reason for the fluid.
Chapter sources [1]
Does no fever rule out infection?
No. Spreading redness, increasing warmth and pain or discharge warrant prompt advice even without fever. Mention wounds, associated illnesses and treatments.
Chapter sources [1]
Must I stop bending the knee?
Not necessarily. Direct pressure and movement do not always have the same effect. After assessment, keep permitted, comfortable movements without forcing a very painful area or one with suspected infection.
Chapter sources [1]
Are knee pads enough to continue working?
They may reduce pressure during return, but do not make every duration of kneeling acceptable. Alternate tasks and check skin and swelling. Infection or a wound needs other precautions.
Chapter sources [2]
Sources and references
- [1] AAOS — Prepatellar bursitis
- [2] NHS — Bursitis
- [3] Assurance Maladie — Douleurs du genou : que faire et quand consulter ?
- [4] CGDIS — 112 Luxembourg
Text updated on
Medical review: awaiting Hasib Selimovic.