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DISLOCATION OF TOTAL HIP PROSTHESES

APPEARANCE ON FRONTAL ROENTGENOGRAMS

RICHARD H. DAFFNER M.D., JOHN A. GEHWEILER M.D., JOHN OLSON M.D., JAMES W. WILSON PH.D., M.D., and TERRENCE S. CARDEN M.D.

The roentgenographic appearance in the anteroposterior projection of dislocations of the McKee-Farrar, Charnley-Müller, and Ring total hip prostheses is described.

Each of these devices has one or more projections on the acetabular component which can be related geometrically to the metallic femoral head. Dislocation, when not grossly apparent, will disturb the normal geometric relationships of each component.

Three signs, the Floating Mine Sign, the Saturn Ring Sign, and the Tin Woodsman Sign are described for each of the above prostheses, respectively.

The more common causes of early dislocation are briefly discussed.


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