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임은현,장호열,박정윤,양국희 대한척추신경외과학회 2010 Neurospine Vol.7 No.3
The authors describe the revision case of a 58‐year‐old man who presented with pain in the neck and both shoulders after C4‐5 cervical total disc replacement(C‐TDR) and C5‐6 anterior cervical discectomy and fusion(ACDF), and in whom there was evidence of instability with sagittal translation at the C4‐5 TDR level and of a herniated cervical disc(HCD) at the left side of C3‐4. The revision surgery was performed as follows: previous plate removal at the C5‐6 level, artificial disc removal and ACDF at the C4‐5 level with cage and previous plate insertion, and TDR at the C3‐4 level using the previously implanted C4/5 artificial disc. If instability develops at the level of an artificial disc, we perform additional posterior fusion or anterior removal of the artificial disc and fusion. However, if we encounter combined adjacent segment disc disease, we may reuse the unstable segment artificial disc at the adjacent segment and perform salvage anterior fusion on the unstable segment. This is the first report issued on the management of instability after previous C‐TDR involving a switch to ACDF and the use of new TDR at the adjacent level. Furthermore, we conceptually recommend a solution to an emerging problem of adjacent segment disease due to the heterotopic ossification(HO) after C‐TDR.
Chitosan Scaffold Supported by Collagen Incorporation for the Improvement of Bioactivity
김정헌,김민정,박은현,송민주,이민선,이병학,임예람,오지영,이우걸 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
In tissue engineering, 3D porous scaffold is essential for the regeneration of damaged tissue. To do so, materials used to prepare the scaffold need to satify prerequisites including biocompatibility, biodegradability, porosity, hydrophilicity, so that the scaffold can promote cell adhesion, proliferation, and differentiation. In this study, we performed feasibility study whether the bioactivity of chitosan (CHN) scaffold can be supported by collagen (COL) incorporation. COL incorporation into CHN scaffold was made at various COL concentrations and the mechanical properties of the scaffold were thoroughly examined. The porosity and degradation behavior of CHN/COL scaffold were analyzed. The bioactivity of the scaffold was evaluated using fibroblast and found that fibroblast proliferation and differentiation were improved.
Characterization of Physicochemical Properties of COL/CHN Complex
김정헌,김민정,박은현,송민주,이민선,이병학,임예람,오지영,이우걸 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Chitosan (CHN) is a natural polymer derived by deacetylation of chitin which is external skeletal compound of crustaceans. CHN is reported to be highly positively charged, biocompabitible and biodegradable. Therefore, CHN is widely used for medical applications including artificial replacement of skin, cartilage, and bone tissues. In addition, collagen (COL) is a major protein constituting human body. COL possess RGD seqeuence which interacts with integrin embedded in cellar membrane and stimulates cell adhesion and differentiation. In this study, we prepared CHN/COL complex film and examined the effect of the complexation on the surface properties of the CHN/ COL-complexed film on the chemical state, morphology, and hydrophilicity using FT-IR, SEM, and goniometer.