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Makoto Kimura,Nobuhiro Kaku,Yuta Kubota,Hiroaki Tagomori,Hiroshi Tsumura 대한정형외과학회 2021 Clinics in Orthopedic Surgery Vol.13 No.3
Background: Plain computed tomography (CT) and magnetic resonance imaging (MRI) are useful for diagnosing adverse local tissue reactions after metal-on-metal total hip arthroplasty (THA), but metal artifacts can hamper radiological assessments near the implants. We sought to clarify the usefulness of 18F-fluorodeoxyglucose positron-emission tomography (18F-FDG-PET) CT and MRI in the periprosthetic region, which is difficult to assess after THA due to metal artifacts. Methods: We performed preoperative 18F-FDG-PET/CT and 18F-FDG-PET/MRI, as well as plain CT and MRI, in 11 metal-on-metal THA patients who underwent revision surgery. Results: Most patients showed high FDG uptake in the metal artifact areas and pseudotumors in the 18-F-FDG-PET/CT and 18-FFDG- PET/MRI scans. Intraoperative intra-articular macroscopic and histopathological intra-articular granulation tissue findings were suggestive of adverse local tissue reaction. Conclusions: The enhanced uptake in the metal artifact areas seemed to reflect adverse local tissue reaction. Therefore, 18F-FDGPET/ CT and 18-F-FDG-PET/MRI can be useful for the auxiliary diagnosis of adverse local tissue reactions after metal-on-metal THA.
Makoto Kimura,Nobuhiro Kaku,Hiroaki Tagomori,Hiroshi Tsumura 대한고관절학회 2020 Hip and Pelvis Vol.32 No.4
Disorders involving artificial joints are difficult to evaluate due to metal artifacts hindering plain computed tomography (CT) or magnetic resonance imaging (MRI). In the current case study 18F-fluoro-deoxyglucose positron emission tomography (18F-FDG-PET)/CT and MRI were used to confirm iliopsoas tendonitis within the metal artifact area following total hip arthroplasty (THA). The patient was a 61-year-old woman who developed hip pain on flexion of the ipsilateral hip after THA. Imaging studies were performed to evaluate for iliopsoas tendonitis due to impingement with the cup. Assessment of the iliopsoas muscle near the artificial joint was difficult due to the metal artifact on plain CT and MRI. Imaging using 18F-FDG-PET/CT and 18F-FDGPET/ MRI showed uptake along the iliopsoas muscle. Therefore, revision was performed to resolve iliopsoas tendon impingement, and the preoperative pain resolved. The result of the current case study suggest 18F-FDGPET/ CT or 18F-FDG-PET/MRI will be useful to detect iliopsoas tendonitis within metal artifact areas after THA.
Gradient Ricci soliton on $O(n)$-invariant $n$-dimensional submanifold in $S^n(1)\times S^n(1)$
조종택,Makoto Kimura 대한수학회 2019 대한수학회지 Vol.56 No.1
We construct gradient Ricci solitons as $n$-dimensional submanifolds in $S^n\times S^n$ by using solutions of some nonlinear ODE.
Luo, Hailing,Kimura, Koji,Hirako, Makoto Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.4
In our previous studies, we demonstrated that Vascular Endothelial Growth Factor (VEGF) enhances bovine oocyte maturation and early embryonic development in serum supplemented media. In this experiment, to determine the synergistic effect of VEGF with serum components on early embryonic development in vitro in cattle, 1 mg/ml polyvinyl-alcohol (PVA) was replaced with foetal bovine serum (FBS) in maturation and culture media. Bovine oocytes were matured in Synthetic Oviduct Fluid (SOF) supplemented with PVA, PVA+5 ng/ml of VEGF, FBS, or FBS+VEGF. Fertilized oocytes were cultured in the same conditions for 8 days. The development of embryos was examined at 48 h post- insemination and on days 6, 7 and 8. The results were analyzed using repeated measures two- factor ANOVA, in which the effects of VEGF and serum were assigned as two factors. The development rate to 4- to 8-cell embryos at 48 h was significantly higher in the PVA+VEGF group than in the PVA group (44.7% and 31.5%, respectively). However, the highest development rate to 4- to 8-cell embryos was obtained from the FBS+VEGF group (58.8%). On day 8, the blastocyst rates were higher in the PVA+VEGF (22.8%), FBS (32.1%, p<0.05) and FBS+VEGF (42.1%, p<0.05) groups than in the PVA group (17.1%). Two- factor ANOVA of the development rates indicates that VEGF had a significant effect, but had no synergistic effect with serum components on early embryonic development. The results of the present study demonstrate that VEGF improves the in vitro developmental competence of bovine oocytes and/or embryos independent of the effect of serum components.
LEVI-UMBILICAL REAL HYPERSURFACES IN A COMPLEX SPACE FORM
CHO, JONG TAEK,KIMURA, MAKOTO Cambridge University Press 2018 Nagoya mathematical journal Vol.229 No.-
<P>We give a classification of Levi-umbilical real hypersurfaces in a complex space form $\widetilde{M}_{n}(c)$, $n\geqslant 3$, whose Levi form is proportional to the induced metric by a nonzero constant. In a complex projective plane $\mathbb{C}\mathbb{P}^{2}$, we give a local construction of such hypersurfaces and moreover, we give new examples of Levi-flat real hypersurfaces in $\mathbb{C}\mathbb{P}^{2}$.</P>
Ricci solitons of compact real hypersurfaces in Kähler manifolds
Cho, Jong Taek,Kimura, Makoto WILEY‐VCH Verlag 2011 Mathematische Nachrichten Vol.284 No.11
<P><B>Abstract</B></P><P>If a compact real hypersurface of contact‐type in a complex number space admits a Ricci soliton, then it is a sphere. A compact Hopf hypersurface in a non‐flat complex space form does not admit a Ricci soliton. © 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim</P>
Cho, Jong Taek,Kimura, Makoto Korean Mathematical Society 2019 대한수학회지 Vol.56 No.1
We construct gradient Ricci solitons as n-dimensional submanifolds in $S^n{\times}S^n$ by using solutions of some nonlinear ODE.