Bursae close to the surface of the skin are the most likely to get infected with bacteria, a condition that is called septic bursitis. The most common bacteria to cause septic bursitis are Staphylococcus aureus or Staphylococcus epidermis . People with diabetes , alcoholism , certain kidney conditions, those with suppressed immune systems such as from cortisone medications (steroid treatments), and those with wounds to the skin over a bursa are at higher risk for septic bursitis. About 85% of septic bursitis occurs in men.
Martha is a 40-year-old, obese woman whose goal is to lose 100 pounds with diet and exercise. She has joined a gym, and she has recently decided to try the latest craze—a zumba class. Martha enjoyed the first week of classes, but after the fourth class, noticed a sharp pain on the inner, lower side of her right knee. It got worse when she bent and straightened her knee and when she walked upstairs to go to bed that night. Martha didn’t want to quit her new exercise routine or zumba class, so she contacted her physical therapist right away.