Большинство бурситов т/б сустава не носят инфекционный характер. Наверное, поэтому врач и не стал "устанавливать причину воспаления".Most commonly, bursitis is a noninfectious condition (aseptic bursitis) caused by inflammation that results from local soft-tissue trauma or strain injury. On rare occasions, the hip bursa can become infected with bacteria. This condition is called septic bursitis.