Abstract: Objective To evaluate the value of imaging manifestations in diagnosing the sacroiliac joint tuberculosis.Methods eighteen cases including 5 males and 13 females with clinically-proved sacroiliac joint tuberculosis were collected,and correlative imaging manifestations and clinical data were retrospectively analyzed.Results All the cases had unilateral joint lesion.Of the 18 cases,the lesions involved right sacroiliac joint in 10 cases(56%),and left sacroiliac joint in 8 cases(44%).The typical imaging findings were as followed:in the early period,the manifestations presented as blurred articular surface and widened joint space;subsequently erosive articular surface,bone defect,bone destruction,and adjacent bone sclerosis could be seen;severe cases manifested as sequestra,joint subluxation,and fibrous or bony ankylosis associated with cold abscess and sinus.Conclusions Imaging can well demonstrate the degree and the type of sacroiliac joint destruction,the region of abscess and adjacent structures,so it has significant effect on diagnosing and differentiating the sacroiliac joint tuberculosis.

Key words: Tuberculosis,sacroiliac joint, Radiography