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Abstract
The effect of the innominate osteotomy according to Salter was investigated by a roentgen stereophotogrammetric method in a 17-year-old girl with hip dysplasia as a part of the tricho-rhino-phalangeal (Giedion) syndrome.
The osteotomy resulted in a total rotation of 32° about an axis passing cranially to the pubic symphysis and the osteotomy. The acetabulum rotated 22° forwards about a transverse axis, 9° laterally about a longitudinal axis and 24° laterally about a sagittal axis. The acetabulum was translated 2 mm laterally along a transverse axis, 21 mm caudally along a longitudinal axis and 19 mm dorsally along a sagittal axis.
The position of the screw axis indicates that some motion also took place in one or both of the sacroiliac joints.
The correction as measured with the CE-angle was 25° which was almost the same as the correction about the sagittal axis. It is, however, noted that the CE-angle was also dependent upon the rotations about the transverse and longitudinal axes.