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PreOp THR X-Rays: Limb Length



- See: Radiology of the Hip:

- Discussion:
     - obtain view w/ 15 deg of internal rotation;
     - draw a line at level of, & parallel to, ischial tuberosities and intersecting the lesser trochanter on each side;
     - compare 2 points of intersection & measure difference to determine the amount of limb shortening;
     - draw horizontal at level of proposed neck cut which may be used as a reference point during surgery;
     - draw a horizontal line at the level of the greater trochanter & see where it intersects on head of femoral component;
     - significant leg length descrepancies can partially be adressed w/ changing prosthetic offset and partially w/ femoral neck cut



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