Metanalysis of Tramadol efficacy & safety in knee or hip #OA. 6 RCTs (3,611 pts) showed little clinical benefit w/ 100/d or 200 mg/d; only 300mg/d was better vs PBO at pain & functional improvement. All doses had higher risk of GI, CNS AEs & W/D https://t.co/wDLHFQWFOe