A Roentgen Stereophotogrammetric Investigation of Innominate Osteotomy (Salter)

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 degrees about an axis passing cranially to the pubic symphysis and the osteotomy. The acetabulum rotated 22 degrees forwards about a transverse axis, 9 degrees laterally about a longitudinal axis and 24 degrees 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 degrees 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.

The accuracy and precision of radiostereometric analysis in upper limb arthroplasty

“…On the other hand, the accuracy of the technique with total hip and knee prostheses has been studied more extensively (Hansson et al. 1978, Kärrholm 1989, Valstar et al. 2005).…”

Migration of the Acetabular Socket After Total hip Replacement Determined by Roentgen Stereophotogrammetry

“…The primary objective of roentgen stereophotogrammetry is to determine the threedimensional co-ordinates of structures in the body , Olsson 1975, 01sson et al 1976, Hansson et al 1978). Generally, there are no sufficiently distinct points in the body to allow a highly accurate identification in the two projections necessary for a three-dimensional reconstruction.…”

“…The radiographic examination (Selvik 1974, Hansson et al 1978) was performed 5-15 days postoperatively and was repeated during the following months (Table 1). Simultaneous exposures of the pelvis with two roentgen tubes on one film were made with the patient supine (Figure 2).…”

Safe fixation with two acetabular screws after Ganz periacetabular osteotomy

“…Radiostereometric measurements of one pelvic osteotomy were performed as early as 1978 (Hansson et al 1978) with the purpose of obtaining information about the position of the acetabulum preand postoperatively, but that study did not evaluate acetabular migration in the time period after surgery. RSA studies estimating migration after fractures have found slightly higher (Ragnarsson et al 1992, Ahl et al1994 or much higher Larsson 2003, 2004) migration compared to the amount of migration we found.…”