The most common reason a knee support disappoints is not the design but the size. Too small and it digs in behind the knee or slides down as it bunches; too large and it offers little more than a loose bandage. A tape measure and five minutes are all you need to get it right.
What you will need
- A soft, flexible tape measure (a dressmaking tape, not a metal DIY one).
- The size chart for the specific product you are buying. Charts vary between brands and even between models.
- Ideally a second person to help, although it is possible on your own.
Where to measure
Most knee supports are sized from one or more of three measurements. Check the product size guide to see which it uses.
Around the centre of the kneecap
Stand with your leg straight and relaxed. Wrap the tape around the leg over the middle of the kneecap, keeping it level. This is the most common measurement for sleeves and wraparound supports.
Above and below the knee
Supports with side stays or hinges are often sized from the circumference of the thigh and calf, measured a set distance above and below the kneecap, commonly 10 to 15 cm. Measure exactly where the chart says, as a few centimetres up or down the thigh can change the reading noticeably.
Standing or slightly bent?
Some charts ask for the knee to be bent to about 30 degrees. Follow the instruction given. If none is given, measure standing with the leg straight.
Tips for an accurate reading
- Measure against bare skin, not over trousers.
- Keep the tape snug but not pulled tight enough to dent the skin.
- Measure both legs if you are buying a pair. They are often slightly different.
- Measure at the end of the day if your knee tends to swell, so the support is not too tight by evening.
- Write the numbers down before you look at the chart.
Reading the size chart
Match your measurement to the range given. If the product uses two measurements and they point to different sizes, most manufacturers recommend going with the larger one for comfort, unless the chart says otherwise. If you are right on a boundary, consider how you will use the support: a firmer fit for short bursts of sport, a slightly more relaxed fit for all-day wear.
How a well-fitted knee support should feel
Once it is on, the support should feel evenly snug all the way round, with no pinching behind the knee and no gap at the top or bottom. The kneecap opening or pad should sit centrally over the kneecap. You should be able to walk, sit and climb stairs normally. If it rolls, slides down or leaves deep marks after a short time, the size or style is not right.
Signs the fit needs changing
- Numbness, tingling or a cold feeling in the lower leg or foot.
- Swelling below the support.
- The support constantly needing to be pulled back up.
- Red, sore skin at the edges after wear.
Frequently asked questions
Should I size up if I have large thighs?
Only if the chart's thigh measurement puts you in the larger size. Some supports are shaped to accommodate a bigger thigh-to-calf difference, so check the product description.
Can I wear a knee support over leggings?
Thin leggings are usually fine, but measure on bare skin and expect the fit to feel a little looser over fabric.
What if I measured and it still feels wrong?
Check it is positioned correctly first. If the fit is still poor, contact the retailer; most will exchange an unworn support for a different size.
Explore knee supports
See the Venollo range of knee supports and read our step-by-step guide on how to put on a knee brace once yours arrives.
This article is general information and is not a substitute for medical advice. If you have an injury, a health condition or ongoing symptoms, please speak to a qualified healthcare professional.
