What is the Donjoy OA Adjuster Knee Brace? Effective support for moderate to severe knee arthritis. Also effective for rehab following knee surgery. When can I use it? To support a knee affected by moderate to severe osteoarthritis Knee support during rehabilitation following knee surgery Medial or lateral compartment versions available- depending on where your knee pain is (indicate version when ordering) What size is it? State left or right knee. Measure around the thigh, 15cm (6") above the kneecap. If you are between sizes, please choose the larger size. X-Small 33-39cm (13-15½") Small 39-47cm (15½-18½") Medium 47-53cm (18½-21") Large 53-60cm (21-23½") X-Large 60-67cm (23½-26½") XX-Large 67-75cm (26½-29½") XXX-Large 75-82.5cm (29½-32") If your pain is on the inner side of the knee you need the Medial Compartment version. If your pain is on the outer side of the knee you need the Lateral Compartment version. How does it work? Commended for ease of use by the Arthritis Foundation, the Donjoy OA Adjuster Knee Brace features the Donjoy Four Points of Leverage™ system which makes your knee feel stable & secure. Made from aircraft grade aluminium, this lightweight (595g / 21oz) brace has floating hinges for a contoured fit & swiveling D-Rings to accommodate leg movement. Swooping thigh & calf cuffs give inner leg clearance & improve comfort. Please Note if buying from abroad: These products are sent direct from the manufacturer & so lead times will be significantly longer than normal if you purchase this item from outside the UK