Abstract
In order to know the indicence, development and prognosis of the clear zone in the acetabular side, radiological examination was done on 104 hip which were followed up for 5 years or more after Charnley THR. The acetabular side in each x-ray picture was divided into four zones. The width of the clear zone in serial x-ray pictures was measured in each acetabular zone and compared among four zones.The incidence of the clear zone 1 year after THR was almost 100% in Zone I, 55% in Zone II, 60% in Zone III and 82% in Zone IV, and 5 years after THR 100% in Zone I, 74% in Zone II, 76% in Zone III and 90% in Zone IV.In 24 hips with less than 1mm width of the clear zone at 5 years after THR, 18 hips did not show further development, however, in 27 hips with 1mm or more 19 hips showed increase of the width and 16 hips had loosening of the socket.It may be concluded that the prognosis of the clear zone within 1mm at 5 years after THR is good.
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