Extract
Fluoroscopy has proven to be an accurate method to determine in vivo
motions1 and has
enabled the extraction of accurate three-dimensional hip-joint kinematics
unaffected by erroneous skin
movements1,2.
Previously, fluoroscopy was used to determine that the femoral head of a total
hip prosthesis slides within the acetabular cup, leading to separation of
certain aspects of the articular
geometry3-5.
This finding has often been referred to as hip separation, where there is a
loss of contact area, leaving only edge contact. Although separation has been
well documented, it has not been correlated to clinical complications nor has
a more in-depth understanding of the cause and effect been developed.