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KMID : 0616620050110010005
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Journal of Soonchunhyang Medical College
2005 Volume.11 No. 1 p.5 ~ p.10
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Femoral Neck Fracture Following Avascular Necrosis of the Femoral Head
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Yim Soo-Jae
Je Han-Woong
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Abstract
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Purpose : This paper studies characteristics, occurrence types, radiographs, MRI(magnetic resonance imaging), and histopathologic findings of femur neck fracture following avascular necrosis of the femoral head.
Materials and Methods : The subjects of this study are femur neck fracture following avascular necrosis of the femoral head occurring in 7 cases of 7 Patients with osteonecrosis of femoral head among 130 cases of 68 patients who were treated at our hospital from March 2001 to March 2005, and analyzed though plain radiography finding, MRI, and histopathologic test.
Results : All 7 cases were found of osteonecrosis of the bilateral femoral head, and most of avascular necrosis in parts of femoral neck fracture had invaded entire femoral head. Simple radiographic findings were 1 case of stage Ⅱ, 4 case of stage Ⅲ, and 2 cases of stage Ⅳ according to the Ficat and Alert classifications, MRI finding included 5 cases of class C, 2 cases of class D according to the Mitchell classification, and all cases found lesions of low signal intensity in T1W1, high signal intensity in T2W2, and other parts. The 1 case of histopathologic test developed femur neck fracture between the necrotic zone and the reparative zone. The form of femoral head fracture includes 5 case of type A, and 2 case of type B according to the Usui classification
Conclusion : A spontaneous femur neck fracture can occur without any special exterior force between the necrotic zone and reparative zone in case invaded with wide range of osteonecrosis of the femoral head.
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KEYWORD
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Femoral head, Avascular necrosis, femoral neck fracture
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