JAMA Review of Knee Pain: - 5% PCP visits for knee pain: - Knee #OA: 654 mill worldwide, mostly >45 yrs age - Patellofemoral OA: < 40 yrs age; Sx: ant knee pain w/ squat - Meniscal tears: 12% adults < 40 yrs; dx by McMurray test & joint line tenderness https://t.co/AKVFXjY0D8 https://t.co/GpBxA2rdLP