Measurement of acetabular component migration using two-dimensional radiography.
The relationships between apparent acetabular component migration, choice of anatomic landmarks, and changes in rotation of the pelvis were determined by examining radiographs of a pelvic model in multiple projections. The minimum apparent migration associated with transverse and longitudinal rotation of 5 degrees from neutral was 2 mm. The least apparent migration was noted when the teardrop was used as the principal anatomic landmark. Determination of component migration in clinical studies from serial radiographs involves a minimum projection and magnification error of 2 mm.
Sutherland
C J
CJ
Department of Surgery, Washington University, St. Louis, Missouri.
Bresina
S J
SJ
D000077:Acetabulum / Q000000981:diagnostic imaging*; D006622:Hip Prosthesis; D006801:Humans; D007091:Image Processing, Computer-Assisted; D011475:Prosthesis Failure; D011859:Radiography