An infrapatellar knee strap, often called a knee strap, is a supportive device designed to apply focused compression just below the kneecap. This targeted pressure interacts with the patellar tendon, which connects the kneecap (patella) to the shinbone (tibia). The primary function of this compression is to redistribute the force traveling through the tendon, reducing strain at its attachment point. This mechanism is frequently used to alleviate discomfort associated with conditions like patellar tendonitis, also known as Jumper’s Knee.
Identifying Correct Placement
Proper positioning is necessary because the device is designed to compress a specific anatomical structure, not the kneecap itself. The target area is the patellar tendon, a thick band of tissue running vertically from the bottom edge of the patella down to the tibial tubercle on the shin. To locate this tendon, first identify the kneecap, the hard, movable bone at the front of the knee joint.
Just below the kneecap is a small, soft groove where the patellar tendon begins. The central, padded portion of the knee strap should be placed directly over this groove, ensuring it is centered horizontally on the leg. Incorrect placement, such as positioning the strap directly on the kneecap or too far down the shin, will render the strap ineffective. The strap should sit on the tendon itself, typically about one inch below the lowest point of the patella.
Step-by-Step Application
To begin application, sit down with the leg extended or slightly bent; this helps relax the muscles and clearly define the tendon area. Take the strap and fully open the hook-and-loop closure mechanism. Center the padded section precisely over the patellar tendon groove, making sure the strap is not twisted or bunched up.
Bring the ends around the back of the knee and feed one end through the buckle or loop, if your specific strap design includes one. Pull the strap firmly around the leg, ensuring it wraps snugly but not tightly. Secure the hook-and-loop fastener, usually Velcro, to hold the strap in place. The strap should be secured evenly, applying uniform pressure to the tendon without pressing into the sides of the knee joint.
Adjusting Tension for Optimal Support
Achieving the correct tension balances support and comfort, ensuring the strap does not impede circulation. A properly fitted knee strap should feel snug and supportive, applying noticeable, gentle pressure to the patellar tendon. The pressure should be firm enough to provide immediate relief during movement, but it must never cause throbbing, numbness, or a tingling sensation in the lower leg, signaling excessive tightness.
A simple test for proper tension involves trying to comfortably slide one or two fingers beneath the strap at the front. If you can easily fit more than two fingers, the strap is too loose and will not provide the necessary support. Conversely, if you cannot fit one finger underneath without a struggle, the strap is too tight and should be loosened immediately. After the initial adjustment, stand up and perform a gentle knee flex or walk a few steps; the strap should remain securely in place without pinching the skin or sliding up or down the leg.