0 months following revision, decreased to a mean of 1.61 ng/mL, and chromium levels were similar to prerevision levels. One patient with moderate hip abductor muscle necrosis developed recurrent instability after revision and required selleck products a second revision arthroplasty.

Conclusions: Adverse local tissue reactions can occur in patients with a metal-on-polyethylene bearing

secondary to corrosion at the modular femoral head-neck taper, and their presentation is similar to the adverse local tissue reactions seen in patients with a metal-on-metal bearing. Elevated serum metal levels, particularly a differential elevation of serum cobalt levels with respect to chromium levels, can be helpful in establishing this diagnosis.”
“A multiscale modeling, involving molecular dynamics and finite element calculations, of the degradation of the thermal conductivity

of polycrystalline silicon carbide due to the thermal (Kapitza) resistances of grain boundaries is presented. selleck kinase inhibitor Molecular dynamics simulations focus on the < 111 > family of tilt grain boundaries in cubic SiC. For large tilt angles a simple symmetry and shift procedure is used to generate the grain boundaries while for small angles the boundary structure is obtained by inserting arrays of edge dislocations. The energy and thermal resistances of the grain boundaries are presented. The latter are fed into a finite element homogenization procedure, which enables to calculate the effective thermal conductivity of the SiC polycrystal as a function of its average grain size. The decrease in the thermal conductivity of a polycrystal as a function of its grain size is qualitatively reproduced. However, available experimental values of the thermal conductivity of polycrystalline SiC tend to indicate that the present Kapitza resistances cannot be directly used for prediction of the thermal conductivity of polycrystalline silicon carbide. We suggest possible explanations for this discrepancy, which seems rather common to Kapitza resistances calculated with molecular dynamics simulations. (C) 2009 American Institute of Physics. [doi:10.1063/1.3240344]“
“Synthesis

of a m/p-cresol-based novolac resin and its subsequent esterification using di-tert-butyl dicarbonate (t-BOC) is described. The product has been characterized using techniques of FTIR spectroscopy, S63845 mouse one dimensional (1)H NMR, (13)C NMR, and DEPT-135 spectra. Two dimensional NMR experiments like, COSY, HSQC, and HMBC have been used for exhaustive probing of the microstructural details of the derivatized copolymer. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 113: 2166-2172, 2009″
“Background: Intraoperative analysis of frozen tissue samples has been used to diagnose periprosthetic joint infection in revision total knee arthroplasty, but the precision and reliability of this test throughout staged revision arthroplasty have not been well characterized.