Case Of the Week (COW) 11 May 2014
Answer:
FATIGUE STRESS FRACTURE SACRUM
Findings:
Linear subchondral STIR hyperintensties are noted in sacral aspect of both sacroiliac joints .. No abnormal bone marrow edema noted in rest of sacral ala or ilium. Corresponding linear fracture lines are noted in CT. These features are consistent with Diagnosis of Stress Fatigue Fracture.
Discussion:
Stress Fatigue Fracture . of sacrum occurs due to Skeletal failure resulting from submaximal repetitive forces over time. Important underdiagnosed cause of low back and buttock pain. common in Long distance runners due to overuse . it is characterized by Vertical fracture line extending parallel to sacroiliac joint and lateral to sacral foramina . In contrast , INSUFFICIENCY STRESS FRACTURE occurs in elderly females and is due to Normal stress to bone with deficient elastic resistance . The STIR hyperintensities involves almost the entire sacral ala.
Contributed By:
Dr. Babupeter
Associate Professor, Barnard Institute of Radiology
Answer:
FATIGUE STRESS FRACTURE SACRUM
Findings:
Linear subchondral STIR hyperintensties are noted in sacral aspect of both sacroiliac joints .. No abnormal bone marrow edema noted in rest of sacral ala or ilium. Corresponding linear fracture lines are noted in CT. These features are consistent with Diagnosis of Stress Fatigue Fracture.
Discussion:
Stress Fatigue Fracture . of sacrum occurs due to Skeletal failure resulting from submaximal repetitive forces over time. Important underdiagnosed cause of low back and buttock pain. common in Long distance runners due to overuse . it is characterized by Vertical fracture line extending parallel to sacroiliac joint and lateral to sacral foramina . In contrast , INSUFFICIENCY STRESS FRACTURE occurs in elderly females and is due to Normal stress to bone with deficient elastic resistance . The STIR hyperintensities involves almost the entire sacral ala.
Contributed By:
Dr. Babupeter
Associate Professor, Barnard Institute of Radiology