01-09-2005 | Original Article
Radiostereometric Analysis: The Hip
Published in: HSS Journal ® | Issue 1/2005
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Radiostereometric analysis is an accurate method of determining the migration and wear of orthopaedic implants such as total hip arthroplasties. While the overall concept of RSA is relatively straightforward: determining the precise location of two distinct objects relative to each other in three dimension such as the relative position of the femoral component and the proximal femur, the actual practical application is somewhat more complex. In radiostereometric analysis the position in space of the original object is reconstructed from a two dimensional x-ray film (Fig. 1). In order to reconstruct the position of segments within the human body, each segment is marked with at least three tantalum beads. Movement between segments is then calculated by localizing each segment in a coordinate system.×
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