With gonarthrosis of the third degree, I can't claim it holds it firmly, but at least it makes it possible for me to walk. Although the Velcro is robust, the threads grow quickly. It generally supports on the sides and prevents the knee from bending fully. However, because it is tied in front, there is no ring, thus it fully unbends and is unable to support the cup. You need to tighten it firmly so that it won't slip.
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