How Do I Measure Myself For a Custom CTi Knee Brace?
Measuring yourself for a custom CTi knee brace is fast and easy. You can take the measurements manually, or, if you have an iPhone, you can use Ossur's Smart Measure app.

How To Take Measurements For a Custom CTi Knee Brace

By Clark on May 12th, 2014

If you are reading this page, then you have probably decided to get yourself fitted for a custom CTi knee brace. Typically, Shop-Orthopedics can send a service technician to your home to take the proper measurements, but if you are outside of our area then we will overnight you a package containing a caliper, tape measure, and marker (it will include a return label so you can ship them back when you're done). It's very simple to measure yourself using these tools, just follow the instructions below.

the caliper, marker, and measuring tape

Please note: If you have an iPhone, there is a special app that can help measure you for the custom brace. This is the preferred and most accurate method of measuring yourself. Search for "Ossur" in the app store - the app is called "Smart Measure" and can help you take accurate measurements. A tutorial video is included in the app as well.

Step 1: Setup The Leg For Measurements.

In order to get the most accurate custom brace possible, you will need mark the leg at the mid point of the patella and along the tibial crest before sending any pictures to Shop-Orthopedics. You will also need to take the circumference at 3" and 6" points above and below the patella. In addition you will need to take a caliper reading at the knee joint.

Don't worry, this is all actually very easy. We will show you how to take the measurements correctly in just a moment. Feel free to record your data in this form as we go.

Before making these marks, you will need to find a good place to stand, and put yourself in an upright, neutral position. Be sure to stand normally, bearing your body weight on both legs in a regular fashion. You will need a friend to mark your leg in the following steps, as bending over could compromise the integrity of the measurements

Step 2: Making the Marks
While standing, have a friend draw a line across the center of the patella, like in the picture below.

mid-patella mark

Have them measure 3 inches up from the mid patella line and make another mark. Then have them measure another 3 inches up from this new mark and make yet another mark. Next, have your friend measure 3 inches down from the mid-patella line and make a mark there. Have them measure 3 more inches down and make one more line. These are your circumference points for 3" and 6" above and below the patella. The leg should look like below:

3 inch knee marks

Have your friend take the circumference of the leg at each line. Be sure to note the measurements in centimeters and not inches - this will allow you to have the most accurate custom brace possible. Don't forget to label your measurements. We recommend using the form above, or writing out "6-inches above, 3-inches above, 3-inches below, 6-inches below" on a piece of paper with the corresponding measurements, just so you don't forget.

Next you need to mark the tibial crest. This is the point where the tibia bone pokes most prominently out of the skin. You can feel it if you run your fingers over it. Simply draw a line across the bone, from just above the first 3 inch line below the patella, to just below the second 3 inch line. See the image below (the darkest line marks the tibial crest):

tibial crest mark

Next, use your calipers to measure the width of the knee across the mid-patella line. Slide the calipers onto the knee, and let them settle for approximately 3 seconds. Mark down your measurement. The top of the calipers (the side with the numbers) should line up with your mid-patella line. Keep the calipers as straight as possible, and remember to allow them to settle before noting the measurement. Read the measurement from where the arrow on the calipers point. See the picture below for a better idea of how to properly use the calipers.

leg caliper measurement

After notating the proper measurements, you will need to take an ANTERIOR and LATERAL picture of the leg. The 'anterior' picture is a simple picture of the front of the leg. It's the same view we used in our models above. The 'lateral' picture is a side view of the leg. This picture would be taken as if you were trying to get a picture of someone's side. See below for a lateral view of the leg.

Once you have completed the measurements, you can email them along with your pictures to so that we can get them to Ossur for analysis and the creation of your custom brace!