Conduction analysis of cement interface temperature in total knee arthroplasty

概要

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We applied an axisymmetric model of the tibia to a finite element method and analyzedthe heat conduction from bone cement in total knee arthroplasty using numerical simulationwith the finite element analysis software, ABACUS. We hypothesized the thermal necroticmap of bone. Moreover, we suggested a method for preventing thermal necrosis of boneusing this simulation.We adopted an initial temperature of 32oC and a cement layer of 3mm to our simulationand analyzed heat conduction. The maximum temperature into the cement layer was 65oCand 56oC at the bone-cement interface 200 sec after the start of heat generation. Bonenecrosis was observed approximately 2mm from the bone-cement interface.To thin the cement layer, the maximum temperature and bone necrotic area reduced. At acement layer of less than 1mm no bone necrotic area was observed. To lower the initialtemperature of the bone surface, the maximum temperature and bone necrotic area was alsoreduced. At an initial temperature of less than 28oC we did not find any bone necrosis. Evenif we hypothesized pouring cold water around the prosthesis, the maximum temperature didnot reduce at any time, neither did the necrotic area reduce.We should make the cement layer as thin as possible and cool the bone before cementingto prevent thermal bone necrosis.
神戸大学の論文