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Diagram showing the reduction sequence of the “foundation” reduction method. (A) The origin of the “foundation” reduction method, which selected anatomical structure with larger contact area as a landmark to guide reduction. If the sacroiliac joint injury existed, the sacroiliac joint was selected as a foundation. If the sacroiliac joint injury was not existing, the residual ilium was selected as foundation. (B) The reduction sequence of BCAF.
