Application of acetabular reinforcement ring with hook for correction of segmental acetabular rim defects during total hip arthroplasty revision
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This study investigated the biomechanical micro-motion associated with the application of acetabular reinforcement ring with hook (Ganz ring) for the correction of segmental acetabular rim defects, by finite element analysis. The objective was to determine whether the Ganz ring is suitable for correcting segmental acetabular rim defects at different regions during total hip arthroplasty revision as well as the number of screws required to fix the Ganz ring. A finite element model of the hip joint was generated to simulate and evaluate the insertion and fixation of the Ganz ring and acetabular cup in the context of segmental rim defects in the anterior column, superior portion, and posterior column. Micro-motion was the greatest in the posterior column defect and the least in the anterior column defect. However, the peak stress distribution on the remaining portion of the acetabular rim was the highest in the superior portion defect, following the posterior column defect and anterior column defect. Increasing the number of fixations of the Ganz ring did not decrease the micro-motion. We found that the Ganz ring effectively provided biomechanical stability during the reconstruction of the segmental rim defect as long as the screws fixed the Ganz ring well to the host bone.
Keywordssegmental acetabular rim defect Ganz ring biomechanics finite element method total hip arthroplasty revision
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This work was supported and funded by the National Nature Science Foundation of Youth in China (No. 81601907), The Outstanding Youth Foundation (20170520019JH) from the Science and Technology Department of Jilin Province.
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