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Computed tomography to assess pelvic lysis after total hip replacement
Alexandra M Claus1, Saara M Totterman, Christi J Sychterz
1Fakultaet fuer Klinische Medizin der Universitaet Heidelberg, Klinikum Mannheim gGmbH, Orthopaedische Universitaetsklinik, Mannheim, Germany.
Clinical Orthopaedics and Related Research
|June 10, 2004
Summary
Computer-assisted computed tomography accurately identifies periacetabular osteolysis locations. This imaging analysis offers a more precise method than plain radiographs for assessing pelvic osteolysis, aiding treatment effectiveness and natural history studies.
Area of Science:
- Orthopedic Surgery
- Radiology
- Medical Imaging Analysis
Background:
- Periacetabular osteolysis is a complication of total hip replacements.
- Accurate assessment of osteolysis location and volume is crucial for patient management.
- Existing imaging methods may have limitations in detecting and quantifying these lesions.
Purpose of the Study:
- To evaluate the accuracy of a computer-assisted computed tomography (CT) image analysis program.
- To determine the program's effectiveness in identifying the location and volume of periacetabular osteolytic lesions.
- To compare CT analysis with plain radiography for pelvic osteolysis assessment.
Main Methods:
- An osteolysis model was created in human pelvic cadavers with total hip replacements.
- Bilateral osteolytic lesions of varying sizes were surgically created.
- Physical volumes were measured, and axial CT scans were acquired.
- CT images underwent artifact reduction and segmentation for lesion analysis.
Main Results:
- Eighty-one percent of osteolytic lesions were correctly identified by CT analysis.
- Detection rates varied by location: ilium (100%), acetabular rim (89%), ischium (78%), pubis (50%).
- CT overestimated lesion volume by a mean of 0.5 cm³, with decreased percentage error for larger lesions (>10 cm²).
Conclusions:
- Computer-assisted CT image analysis demonstrates significant accuracy in detecting periacetabular osteolysis.
- This method provides more accurate volumetric assessment compared to plain radiographs.
- CT analysis is a valuable tool for investigating treatment efficacy and the natural history of pelvic osteolysis.