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RISS 인기검색어
- 검색키워드
- 저자 : Guyton, Kathryn Z (검색결과 3 건)
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Carcinogenicity of fluoro-edenite, silicon carbide fibres and whiskers, and carbon nanotubes
Grosse, Yann,Loomis, Dana,Guyton, Kathryn Z,Lauby-Secretan, Bé,atrice,El Ghissassi, Fatiha,Bouvard, Vé,ronique,Benbrahim-Tallaa, Lamia,Guha, Neela,Scoccianti, Chiara,Mattock, Heidi,Straif, Elsevier 2014 The Lancet. Oncology Vol.15 No.13
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J. Leonard Goldner Award 2008: Effect of Extracorporeal Shock Wave Therapy on Cultured Tenocytes
Han, Seung Hwan,Lee, Jin Woo,Guyton, Gregory P.,Parks, Brent G.,Courneya, Jean-Paul,Schon, Lew C. SAGE Publications 2009 Foot & ankle international Vol.30 No.2
<P>BACKGROUND: Little has been reported about the biologic effect of shock waves on human normal or pathologic tendon tissue. We hypothesized that inflammatory cytokine and MMP production would be down-regulated by shock wave stimulation. MATERIALS AND METHODS: Diseased Achilles tendon tissue and healthy flexor hallucis longus tissue were used. Shock wave treatment was applied to cultured cells at 0.17 mJ/mm(2)energy 250, 500, 1000, and 2000 times. RESULTS: A dose-dependent decrease in cell viability was noted in cells receiving 1000 and 2000 shocks (86.0 +/- 5.6%, p = 0.01 and 72.4 +/- 8.9%, p = 0.001) as compared with the normal control. Cell count in the 500-shock group increased by 23.4% as compared with the control (p = 0.05). The concentration of MMP 1, 2, and 13 was higher in diseased tenocytes as compared with normal cells (p = 0.04, all comparisons). IL-6 levels were higher in the diseased tenocytes as compared with normal tenocytes (44.10 +/- 16.72 versus 0.21 +/- 0.55 ng/ml, (p < 0.05). IL-1 levels in normal cells increased (2.24 +/- 5.02 ng/ml to 9.31 +/- 6.85 ng/ml) after shock wave treatment (p = 0.04). In diseased tenocytes, levels of MMP-1 (1.12 +/- 0.23 to 0.75 +/- 0.24 ng/ml; p = 0.04) and MMP-13 (1.43 +/- 0.11 to 0.80 +/- 0.15 ng/ml; p = 0.04) were significantly decreased after shock wave treatment. The IL-6 level in diseased tenocytes was decreased (44.10 +/- 16.72 to 14.66 +/- 9.49 ng/ml) after shock wave treatment (p = 0.04). CONCLUSION: Higher levels of MMPs and ILs were found in human tendinopathy-affected tenocytes as compared with normal cells. ESWT decreased the expression of several MMPs and ILs. CLINICAL RELEVANCE: This mechanism may play an important role in shock wave treatment of tendinopathy clinically.</P>
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반월형 근위 중족골 절골술에 대한 보강적 축성 K-강선 고정술 : 생체역학적 연구
정홍근,김유진,Jung, Hong-Geun,Kim, You-Jin,Guyton, Gregory 대한족부족관절학회 2003 대한족부족관절학회지 Vol.7 No.2
Purpose: Proximal crescentic metatarsal osteotomy(PMO) is one of the most common procedures for correcting moderate to severe degree hallux valgus deformity. Although screw fixation is used for osteotomy site stability, loss of reduction can occur. The purpose of this study is to compare the sagittal plane stability of the conventional crescentic PMO fixed with a single screw with that of the crescentic PMO fixed with 1 screw and 2 supplemental K -wires. Material and Methods: Ten matched pairs of cadaveric foot specimens were used for the proximal crescentic metatarsal osteotomy. For one foot specimen of each pair, crescentic osteotomy was fixed with 4mm long threaded cannulated screw, while the matched pair was prepared by adding two axial 1.6mm K-wires to the conventionally fixed 4mm screw. The extensometer was used to measure the osteotomy gap as the metatarsal head was loaded continuously until failure using a servohydraulic MTS Mini Bionix test frame. The strength of fixation was normalized with the bone mineral density (BMD) of the paired specimen $(N{\times}cm^{2}/gm)$, Result: The average strength of the crescentic PMO with axial K-wire fixation ($458.8cm^{2}/gm$, S.D. 434.3) was significantly higher than the standard crescentic PMO ($367.5cm^{2}/gm$, S.D. 397,9) (p=0.05). Conclusion: Supplemental fixation with two axial K-wires can be added to the crescentic PMO to enhance the initial fixation stability to prevent the loss of reduction or dorsal malunion.
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