Correlation between bone marrow edema and collapse of the femoral head in steroid-induced osteonecrosis.
OBJECTIVE
The purpose of this study was to clarify whether bone marrow edema is detectable on initial MR imaging of steroid-induced osteonecrosis of the femoral head.


METHODS
Forty-eight hips with osteonecrosis were examined consecutively with MR imaging and radiography. In a previously reported screening program, osteonecrosis was diagnosed on MR imaging when subchondral bands of abnormal signals were present. In the screening program, the MR images of 200 hips of 100 patients receiving high-dose steroid therapy were examined prospectively. Subchondral bands were detected in 48 hips at a mean of 14 weeks after the initiation of steroid therapy.


RESULTS
On follow-up MR imaging of 47 hips (one hip excluded) bone marrow edema was initially observed in 13 hips after the onset of hip pain. MR imaging of the remaining 34 hips did not reveal bone marrow edema and the patients were all asymptomatic. MR imaging of 31 of the 34 hips continued to show subchondral bands and MR imaging of the other three hips indicated that the subchondral bands had disappeared. When bone marrow edema was detectable, abnormal findings on radiography were slight but 11 (85%) of the 13 hips progressed to advanced osteonecrosis. Bone marrow edema was highly correlated with the subsequent collapse of the femoral head (p<0.0001).


CONCLUSIONS
Bone marrow edema was not present on initial MR imaging of osteonecrosis. Bone marrow edema should be considered a marker for potential progression to advanced osteonecrosis, and careful examinations for osteonecrosis are necessary when bone marrow edema is seen.
Iida
S
S
Department of Orthopaedic Surgery, Chiba University School of Medicine, Chiba City, Japan.
Harada
Y
Y
Shimizu
K
K
Sakamoto
M
M
Ikenoue
S
S
Akita
T
T
Kitahara
H
H
Moriya
H
H
D000293:Adolescent; D000305:Adrenal Cortex Hormones / Q000008:administration & dosage / Q000009:adverse effects*; D000328:Adult; D000368:Aged; D001853:Bone Marrow / Q000187:drug effects / Q000473:pathology; D001855:Bone Marrow Diseases / Q000139:chemically induced* / Q000175:diagnosis / Q000473:pathology; D002648:Child; D004305:Dose-Response Relationship, Drug; D004487:Edema / Q000139:chemically induced* / Q000175:diagnosis / Q000473:pathology; D005260:Female; D005270:Femur Head / Q000187:drug effects / Q000473:pathology; D005271:Femur Head Necrosis / Q000139:chemically induced* / Q000175:diagnosis / Q000473:pathology; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008403:Mass Screening; D008875:Middle Aged; D011446:Prospective Studies; D012307:Risk Factors; D012680:Sensitivity and Specificity
D000305:Adrenal Cortex Hormones