Also called: Housemaid's knee; carpet-layer's knee; student's elbow; prepatellar and olecranon bursitis
Relief and prevention
Strength
Massage
A swelling like a small balloon on the front of the kneecap or the point of the elbow. A friction sac has filled with fluid after repeated pressure or a knock - it looks alarming and the joint underneath is usually completely fine.
How common: Olecranon bursitis is the commonest superficial bursitis and prepatellar the second; both cluster in kneeling and leaning trades - carpet layers, tilers, plumbers, roofers, cleaners, miners
What it is
A bursa is a thin sac that lets skin slide over bone. The one in front of the kneecap and the one at the tip of the elbow sit right under the skin, which is why they are the two that get irritated by pressure - kneeling on hard floors, leaning on a desk, or a single direct knock.
The swelling can be dramatic and it is superficial. The knee or elbow joint underneath is typically normal, movement is usually preserved, and the alarming appearance is largely about how close the sac is to the surface. The important distinction is whether it is infected, which changes everything.
What it feels like
- A soft, fluid-filled swelling directly over the kneecap or the point of the elbow
- Often surprisingly painless, or only tender when pressed or knelt on
- The joint itself moving normally, which is the reassuring feature
- Following a period of kneeling or leaning, or a single knock
- Red, hot, painful and spreading if infected, which is a different situation
What causes it
Most people have more than one of these at once, and they feed each other. Read the
list looking for the two or three that sound like your week rather than for the one
true answer — the ones that describe you are the ones worth acting on.
- Repeated pressure
- Kneeling on hard floors or leaning on the elbow for hours irritates the sac, which responds by producing more fluid. It is a friction and pressure problem rather than a joint one.
- A single direct knock
- A fall onto the knee or elbow can bleed into or irritate the bursa acutely, producing rapid swelling.
- Occupational kneeling
- Carpet fitters, plumbers, tilers, gardeners and cleaners are the classic groups, which is why the condition has half a dozen occupational nicknames.
- Leaning on the elbow
- Desk workers, drivers with an arm on the window, and anyone who props on the elbow for long periods develop the elbow version.
- Infection
- Because the bursa sits just under the skin, a small cut or graze can let bacteria in. Septic bursitis is common in these two locations specifically and it needs antibiotics rather than rest.
- Gout and inflammatory arthritis
- Crystals or inflammatory disease can inflame a bursa. Olecranon bursitis is a recognised presentation of gout.
- Poor kneeling surfaces
- Hard floors without padding concentrate all the pressure on a small area. A knee pad or cushion changes the mechanics entirely.
- Repeated aspiration
- Draining the fluid gives immediate relief and it frequently refills, and each aspiration carries an infection risk. It is not a first-line treatment for the ordinary pressure-related version.
- Continuing the activity
- The sac cannot settle while the pressure that caused it continues. Removing the pressure is the treatment and it is the step most often skipped.
Who tends to get it
- Anyone whose work involves kneeling - trades, cleaning, gardening
- Desk workers and drivers who lean on their elbows
- People who have had a direct knock to the knee or elbow
- Anyone with gout or inflammatory arthritis
- People with diabetes or reduced immunity, in whom infection is more likely
What makes it worse, and what settles it
Makes it worse
- Continuing to kneel or lean on the affected area
- Kneeling on hard floors without padding
- Repeated draining, which relieves briefly and risks introducing infection
- Ignoring redness, heat, spreading and fever, which indicate infection
- Assuming a swollen elbow or knee must mean a joint problem, which delays the right treatment
Settles it
- Removing the pressure - knee pads, a cushion, not leaning on the elbow
- A compressive support or bandage while it settles
- Ice in the acute phase and, later, gentle movement to keep the joint mobile
- Strengthening the leg so kneeling and getting up are easier, reducing the time spent on the knee
- Getting it seen promptly if it becomes red, hot or painful, which suggests infection
What actually helps
The short version: A friction sac sitting between skin and bone fills with fluid after repeated pressure or a single knock. It is a loading problem rather than a joint problem - the joint underneath is usually completely fine, which is why the swelling looks far more alarming than it is
Strength work: Legs: Quads; Glutes: Max - so you can get down and up through the hips instead of dropping onto the kneecap; Arms: Triceps; Shoulders: Rotator Cuff for the elbow version
Stretching: Legs: Quads; Hips: Flexors; Legs: Calves - ankle range is what lets you kneel upright instead of sitting back on the kneecap
Massage: Legs: Quads; Arms - around the swelling only. Never work directly over a swollen bursa, and not at all if it is hot or red
Also worth doing: Gel knee pads rather than foam; change position every 20 minutes; a desk that does not park your elbow on a hard edge
What the evidence says: The treatment is load removal plus padding; the exercise contribution is indirect - hip and ankle range so the position can be avoided. Aspiration and injection are second-line, and infection has to be excluded first.
The names above are the Targets qFIT tracks —
the Muscle Guide explains what each one does, and
Quick Add switches on the Exercises you
already have.
The qFIT routine for this
Ready-made routineGetting Down & Up: Squat, Kneel & Floor
qFIT already has this one built. It runs massage first, then stretching, then
strength — the order that works on a body that is already sore — and every
activity in it carries the reason it is there.
The button below opens your Checklist with this routine already selected, so instead
of your whole list you land on just its Categories, Targets
and Exercises, each with its checkbox, ready to tick as you work through
them.
Have more than one problem? Tick yours under My Problems on
My Profile and your Checklist's Routine list gains
Recommended for my problems — every routine for the problems you picked, merged
into one. Your picks stay private; that filter is the only thing they feed.
Get it checked if…
Hot, red, exquisitely tender skin over the swelling, a fever, or a break in the skin - septic bursitis needs same-day antibiotics and is the reason not to just push through this one
And whatever the body part: chest pain or unusual breathlessness on
exertion; a fever alongside the pain; unexplained weight loss; pain that is constant and
unrelated to how you move; new numbness, weakness or loss of bladder or bowel control; or
one calf that is swollen, warm and painful. Any of those, stop and get assessed.
How it usually goes
Uninfected bursitis settles over two to six weeks once the pressure is removed, though the sac often remains slightly thickened afterwards and refills easily with the same activity. Prevention is straightforward and specific: pad the surface or change the habit. Septic bursitis is common in these two locations and needs antibiotics, sometimes urgently - a bursa that is red, hot, increasingly painful, or accompanied by fever should be seen the same day.
Prevalence basis: Occupational and primary-care bursitis case series
Others the same routine covers
These share the Getting Down & Up: Squat, Kneel & Floor routine, so the work is the same. If one of them also
sounds like you, that is a reason to expect more from it, not less.
This is general information, not a diagnosis, and it cannot examine you.
If it matches you, use it to ask better questions of a clinician rather than to replace one.