The front opening design and easy open closure straps make the brace suitable of the arthritic or elderly patient who may suffer from limited dexterity spiral stays provide stabilization and support for the knee following strains injury or surgery for arthritic knee conditions minor sprains and strains measure around the mid section of the knee while in a standing position small 30 5 34 3cm medium 34 3 38 1cm large 38 1 41 9cm extra large 41 9 45 7cm extra extra