![]() A significant negative correlation between age and global sodium SNR for cartilage was found in the medial facet (R = −0.512 R2 = 0.26 p = 0.030). The mean SNR in sodium images for cartilage was 13.4 ± 2.5 in patients and 14.6 ± 3.7 in volunteers (n.s.). Results: Two out of nine patients showed a maximum cartilage defect of International Cartilage Repair Society (ICRS) grade 3, three of grade 2, three of grade 1, and one patient showed no cartilage defect. Mean global sodium values and SNR were compared between patients and volunteers. Morphological cartilage grading was performed, and sodium signal-to-noise ratio (SNR) values were calculated. Axial sodium (23Na) images were derived from an optimized 3D GRE sequence on a 7-T MR scanner. Methods: For detailed diagnosing, a 7-T MRI of the knee joint and patella was performed in nine patients, with mean age of 26.4 years, after patella dislocation to measure the cartilage content in three different regions of interest of the patella. Aim of this study was to develop a more detailed method for examining cartilage tissue, in order to reduce patient discomfort and time of care. Level of evidence: II.Ībstract = "Purpose: Retropatellar cartilage lesions often occur in the course of recurrent patella dislocation. Conclusions: Utilization of the 23Na MR imaging will make earlier detection of alterations to the patella cartilage after dislocation possible and will help prevent subsequent disease due to start adequate therapy earlier in the rehabilitation process. Mixed-model ANOVA yielded a marked decrease of the sodium SNR, with increasing grade of cartilage lesions (p < 0.001). ![]() A significant negative correlation between age and global sodium SNR for cartilage was found in the medial facet (R = −0.512 R 2 = 0.26 p = 0.030). Axial sodium ( 23Na) images were derived from an optimized 3D GRE sequence on a 7-T MR scanner. ![]() Purpose: Retropatellar cartilage lesions often occur in the course of recurrent patella dislocation. ![]()
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