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The Journal of Bone and Joint Surgery, Vol 75, Issue 3 395-401, Copyright © 1993 by Journal of Bone and Joint Surgery, Inc
Diagnosis of occult fractures about the hip. Magnetic resonance imaging compared with bone-scanning
PF Rizzo, ES Gould, JP Lyden and SE Asnis
Department of Orthopaedic Surgery, Hospital for Special Surgery, New York City.
Sixty-two consecutively seen patients in whom a fracture about the hip was
clinically suspected, but in whom the radiographic findings were negative,
were examined with both magnetic resonance imaging and bone-scanning. The
magnetic resonance-imaging studies, consisting of T1-weighted coronal
sections, were done within twenty-four hours after admission to the
hospital, and the bone scans, within seventy-two hours after admission.
There were twenty-three men and thirty-nine women. Thirty-six patients who
had evidence of a fracture on the magnetic resonance-imaging study also had
a positive bone scan initially. Twenty-three patients who had a negative
finding on the magnetic resonance-imaging study had a corresponding
negative bone scan. Two additional patients had evidence of avascular
necrosis of the femoral head on both the magnetic resonance image and the
bone scan, and they were managed non-operatively. One patient had a
positive magnetic resonance image and a negative bone scan twenty-four
hours after admission. A repeat bone scan, which was made six days later,
was positive for a fracture of the femoral neck and the patient was managed
with internal fixation. Magnetic resonance imaging was as accurate as
bone-scanning in the assessment of occult fractures of the hip. The
magnetic resonance imaging took less than fifteen minutes to perform, and
it was tolerated well by the patient. Magnetic resonance imaging provides
an early diagnosis of occult fractures about the hip and may decrease the
length of the stay in the hospital by expediting definitive treatment.

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