http://www.emedicine.com/pmr/topic104.htmPes anserine bursitis is an inflammatory condition of the medial knee, especially common in certain patient populations, often coexisting with other knee disorders.
In a descriptive study of 94 diabetic patients, pes anserine bursitis was reported in 91% of diabetic women and 9% of diabetic men. Among affected women with diabetes, 62% had the disease bilaterally. No subjects in a control group had bursitis without diabetes. Pes anserine bursitis is associated with obesity, and the diabetic patients in the study had greater body mass than the controls on average. Researchers, however, reported that body mass alone did not explain the higher incidence of bursitis among individuals with diabetes.