DonJoy® OA Reaction Web Knee BraceDonJoy OA Reaction Web Knee Brace The DonJoy OA Reaction Web is the lowest profile knee brace on the market to treat early or mild OA (osteoarthritis). The patented silicone web technology provides a custom fit that won't slip; it's so comfortable, users may forget they're wearing a brace. A new level of bracing comfort for those with early to mild OA of the knee, or early joint space narrowing. The DonJoy OA Reaction Web offers discreet wearability