What is the Donjoy OA Lite Knee Brace? Put it on & get instant relief from arthritis knee pain. Pioneering technology arthritis knee brace that relieves pain & can delay the need for knee replacement surgery. When can I use it? Perfect for reducing the painful symptoms of knee arthritis. Which knee brace options do I need? To choose the perfect Donjoy OA Lite Knee Brace for your needs, follow these 3 simple steps: 1) Knee Choose whether you need the brace for your left or right knee. 2) Compartment If the pain of your Arthritis is mostly on the inner side (Medial) & front of the knee, choose the Medial Compartment option. If the pain of your Arthritis is mostly on the outer side (Lateral) & front of the knee, choose the Lateral Compartment option. 3) Size Finally, measure around the thigh, 15cm above the centre of the knee cap. If measurements indicate two different sizes, then choose the larger size. Please select which knee is required when purchasing. X-Small 33-39cm (13-15.5") Small 39-47cm (15.5-18.5") Medium 47-53cm (18.5-21") Large 53-60cm (21-23.5") X-Large 60-67cm (23.5-26.5") XX-Large 67-75cm (26.5-29.5") XXX-Large 75-82.5cm (29.5-32") How does it work? The Donjoy OA Lite Knee Brace helps to stop the progression of arthritis by taking the load off the knee. The angled orthosis hinge & comfortable Floam condyle pad within the brace work together as a wedge to change the position of the knee joint. This relieves the bone on bone contact, immediately relieving the aggravating load on the knee during everyday activities. Simply select the correct model depending on the location of your knee pain.