Mueller Hg80® Premium Hinged Knee Brace We equip athletes with the most advanced sports medicine products available. And that includes the Hg80® Premium Hinged Knee Brace. You get comfort and maximum medial-lateral support for your weak or injured knee. The Triaxial Hinge is the standard by which all other hinged knee braces are judged. It closely simulates the natural tracking of the knee joint.