I still believe this has to do with the use of Floroquinolone Antibiotics (Cipro, Levaquin, etc). These weaken the connective tissue, especially the tendons. The effect is usually not noticed until well after the course of treatment. Not a big deal for most ordinary folks like me who just get soreness, but you add a lot of stress on that tendon and the result can be very bad. FDA has added a black box warning, but I wonder if that is getting as much attention as it should http://www.everydayhealth.com/drugs/levaquin