Based on four typical cases of tuberculous trochanteritis, the authors describe the clinical symptoms and signs, and radiological findings in this osteitis. An unusual feature of this affection is the usually slow progression of the anatomical changes, especially in vaccinated adults. Another peculiarity arises from the fact that this para-articular osteitis (which menaces the hip) is probably secondary to a bursitis of the gluteus medius. A history of tuberculosis infection facilitates the diagnosis, which must be confirmed by bacteriological or histological examinations before instituting medical treatment.