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Koki Mitani,Toshiyuki Takahashi,Shinya Tokunaga,Tomoo Inoue,Ryo Kanematsu,Manabu Minami,Junya Hanakita 대한척추신경외과학회 2023 Neurospine Vol.20 No.4
Objective: The treatment of osteoporotic vertebral compression fractures (OVCFs) is based on their severity; however, an efficient prediction tool is lacking. We aimed to evaluate the validity of the osteoporotic fracture classification (OF classification) and scoring system (OF score) in predicting the treatment strategy for patients with OVCF, defined according to the Japanese criteria. Methods: We retrospectively investigated 487 consecutive patients diagnosed with vertebral body fractures between January 2018 and December 2022. Only patients with their fresh vertebral fracture episode during the study period were included. Patients were classified into 3 groups: conservative treatment, balloon kyphoplasty (BKP), and open surgery. OF classification and OF scores were assessed for each patient. Results: A total of 237 patients with OVCF were included. There were 127, 81, and 29 patients in the conservative, BKP, and open surgery groups, respectively. The OF score was significantly higher in the BKP and open surgery groups than in the conservative group (p < 0.001). Multivariate logistic regression analysis showed that antiosteoporotic drug use, OF classification, progressive deformity, neurological symptoms and mobilization were independent risk factors for operative treatment (all p < 0.001). Receiver operating characteristic analysis showed that the cutoff OF score for operative indication was 5.5, with a sensitivity of 91.9%, specificity of 56.5%, and area under the curve of 0.820 (95% confidence interval, 0.769–0.871). Conclusion: The OF score identified patients who required operative treatment with a high degree of accuracy. This is especially important for ruling out patients who definitely require operative treatment.
Pressure-enhanced Giant Magnetoresistance in Fe/Cr Magnetic Multilayers
Gendo Oomi,Shuhei Higashihara,Kazufumi Suenaga,Kesami Saito,Koki Takanashi,Seiji Mitani 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
The magnetoresistance of Fe/Cr magnetic multilayers (MMLs) on the 1st and the 2nd peakshas been measured at high pressure up to 3 GPa at low temperature in order to make clear thecharacteristics of the giant magnetoresistance (GMR) under high pressure. The GMRs of the MMLson the 2nd peak are found to be enhanced strongly by applying pressure whereas those of 1st peakMMLs decrease with increasing pressure. The magnitude of GMR of the 2nd peak MMLs becomesabout twice or more at 2 GPa compared with the value at ambient pressure. The large differencein the pressure dependences is explained by assuming a pressure-induced crossover in the interlayerexchange coupling from the biquadratic to the bilinear spin arrangements.