MRIを用いたACL再建術後における大腿骨骨孔位置および径の評価

抄録

Purpose

　The assessment of bone foramina is essential for evaluating surgical results after ACL reconstruction. Typically, CT scans are used to evaluate bone tunnels, whereas 3D MRI images are rarely used for evaluation. Therefore, the purpose of this study was to use MRI to verify whether surface renderings created using the image processing software installed in the MRI system were useful for evaluating femoral bone tunnels without using workstation software.

Method

　To determine the optimal 3D sequence parameters for evaluating bone tunnels, we created 3D images of 20 male and 20 female patients, aged 15-56 years who underwent ACL reconstruction surgery and evaluated the images using the quadrant method. We compared CT and MRI using the quadrant method to determine whether MRI can be used to evaluate bone tunnels.

Conclusion

　Calculation of concordance rates among kappa coefficients of MRI and CT images for the position coordinates and foramina diameters obtained by the quadrant method determined kappa coefficients which were ≥0.87. Accordingly, MRI using surface rendering is a useful imaging method without exposure to radiation as an alternative to CT for bone hole evaluation after ACL reconstruction.