Hemodynamic evaluation of flow to the femur head in patients with systemic lupus erythematosus

Kim, Hyeon Jeong; Oh, Ji Hyun; Ahn, Kwang Soon; Kim, Dong Gyu; Shin, Mi Jeong; Lee, Choong Won

Abstract

BACKGROUND: One of the groups with highest risk for avascular necrosis is patient with systemic lupus erythematosus (SLE). Corticosteroid therapy is also the most important risk factor. No predictive test, however, was known to detect avascular necrosis. The purpose of this study is to evaluate hemodynamic flow to the proximal femur in patients with SLE with long term corticosteroid therapy.
METHODS
Twenty-two patients with SLE without avascular necrosis and with long-term corticosteroid treatment (mean months; 41 (1-156)) versus 15 healthy controls were evaluated. Medial and lateral circumflex arteries of 44 hips in 22 SLE patients and 30 hips in healthy controls were examined using ultrasoud equipment with color Doppler and power Doppler capability. Arterial pulstality index (PI) and peak systolic velocity (PSV) were determined with neutral and internal rotation position (stimulated ischemia).
RESULTS
PSV was significantly increased in patients with SLE than healthy controls (70.6+/-40.4 vs 46.9+/-19.3; p<0.001) with neutral position as well as (74.8+/-42.3 vs 49.9+/-19.9; p<0.001) with internal rotation. PI was also higher in SLE patients than healthy controls (8.9+/-6.3 vs 5.5+/-3.4; p<0.001) with neutral position as well as (8.1+/-7.1 vs 3.9+/-2.5; p<0.001) with internal rotation. PI strongly correlated with PSV (r=0.99, p<0.001). But PSV or PI did not correlate with duration of corticosteroid use.
CONCLUSION
Peak systolic velocity and pulstality index of arteries to the femur head in patients with SLE with long-term corticosteroid treatment were significantly higher than healthy controls. These hemodynamic changes may contribute to develop avascular necrosis of the hip in patients with SLE.