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a Sagittal STIR (short T1 inversion recovery) of the left hip joint before treatment with HBO shows geographical subarticular area of high-signal intensity in the head of femur involving 45% of the femoral head (stage IC, severe). No detected structural collapse of the head. b Sagittal STIR of the left hip after treatment shows that decrease in the subarticular is of high-signal intensity involving about 25% of the femoral head (stage IB, moderate) denoting improvement of the condition.
