Article: Locate the center of the knee cap. Have your helper place the end of the measuring tape on that point and then wrap the tape around your knee until it comes back to rest on the end of the tape. Read the measurement at the point where the tape meets. Write down your measurements as you go. Identify which spot is the most painful and mark that with a felt marker. Many knee braces require a measurement of your leg above and below this point. To do this, have your helper measure up 6 inches (15 cm) from the injured area and mark that spot with your finger or a washable felt pen. Then have your helper measure around your leg at the spot you have marked.  Repeat this process below your knee as well. The distance you need to go from the knee cap varies by brace, so check with the manufacturer's website to figure out what exact measurements are required. Having an upper and lower measurement will ensure that the support pieces of the brace you pick fit around your thigh and calf. Don't let the measuring tape sag or get twisted while you have it wrapped around the knee. This can impact that measurements that you get. The measuring tape doesn't need to be so tight that it cuts off your circulation. You simply want to make sure that it is getting a true measurement of the circumference of your leg.
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Measure the distance around the injured knee. Measure above and below your knee. Keep the measuring tape tight and level.