2D/3D registration for measurement of implant alignment after total hip replacement

Measurements of cup alignment after total hip replacement (THR) surgery are typically performed on postoperative pelvic radiographs. Radiographic measurement of cup orientation depends on the position and orientation of the pelvis on the X-ray table, and its variability could introduce significant m...

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Published inMedical image computing and computer-assisted intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention Vol. 9; no. Pt 2; p. 653
Main Authors Jaramaz, Branislav, Eckman, Kort
Format Journal Article
LanguageEnglish
Published Germany 2006
Subjects
Aged
Aged, 80 and over
Algorithms
Arthroplasty, Replacement, Hip - methods
Artificial Intelligence
Equipment Failure Analysis - methods
Female
Hip Joint - diagnostic imaging
Hip Joint - surgery
Humans
Imaging, Three-Dimensional - methods
Male
Middle Aged
Pattern Recognition, Automated - methods
Prognosis
Prosthesis Fitting - methods
Radiographic Image Enhancement - methods
Radiographic Image Interpretation, Computer-Assisted - methods
Reproducibility of Results
Sensitivity and Specificity
Subtraction Technique
Tomography, X-Ray Computed - methods
Treatment Outcome
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Summary:Measurements of cup alignment after total hip replacement (THR) surgery are typically performed on postoperative pelvic radiographs. Radiographic measurement of cup orientation depends on the position and orientation of the pelvis on the X-ray table, and its variability could introduce significant measurement errors. We have developed a tool to accurately measure 3D implant orientation from postoperative antero-posterior radiographs by registering to preoperative CT scans. The purpose of this study is to experimentally and clinically validate the automatic CT/X-ray matching algorithm by comparing the X-ray based measurements of cup orientation with direct 3D measurements from postoperative CT scans. The mean measurement errors (+/- stdev) found in this study were 0.4 degrees +/-0.8 degrees for abduction and 0.6 degrees +/- 0.8 degrees for version. In addition, radiographic pelvic orientation measurements demonstrated a wide range of inter-subject variability, with pelvic flexion ranging from -5.9 degrees to 11.2 degrees.