FIGURE 4.7. Bilateral osteonecrosis of the femoral head. (A) Coronal Tl-weighted image of both hips demonstrates a linear focus of decreased signal (arrow) parallel to the articular surface in the right femur defining the margin of the osteonecrotic segment. Also, a large heterogeneous area of decreased signal is seen in the left femoral head extending into the left femoral neck. (B) Coronal T2-weighted fat-suppressed images of both hips reveals a large left hip effusion, increased signal in the left femoral head and neck (class C), and small focal areas of increased signal in both femoral heads. (C) Coronal Tl-weighted image of both hips anteriorly demonstrates a linear ring (arrows) of low signal defining the margin of the osteonecrotic focus that is isointense with fat (class A).
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This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.