crestor (Rosuvastatin) is used along with a proper diet to help lower bad cholesterol and fats (such as LDL, triglycerides) and raise good cholesterol (HDL) in the blood. It belongs to a group of drugs known as statins. It works by reducing the amount of cholesterol made by the liver. Lowering bad cholesterol and triglycerides and raising good cholesterol decreases the risk of heart disease and helps to prevent strokes and heart attacks. but it doesn t have serious side effects in many people .. it may causes muscle weakness but not arthritis .. please consult orthopedist because your history seems to be arthritis . I hope you happy with information thank you.