NDLI: Thermal Conductivity of Human Bone in Cryoprobe Freezing as Related to Density.

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Thermal Conductivity of Human Bone in Cryoprobe Freezing as Related to Density.

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Thermal Conductivity of Human Bone in Cryoprobe Freezing as Related to Density.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Walker, Kyle E. Baldini, Todd Lindeque, Bennie G.
Abstract	Cryoprobes create localized cell destruction through freezing. Bone is resistant to temperature flow but is susceptible to freezing necrosis at warmer temperatures than tumor cells. Few studies have determined the thermal conductivity of human bone. No studies have examined conductivity as related to density. The study goal was to examine thermal conductivity in human bone while comparing differences between cancellous and cortical bone. An additional goal was to establish a relationship between bone density and thermal conductivity. Six knee joints from 5 cadavers were obtained. The epiphyseal region was sliced in half coronally prior to inserting an argon-circulating cryoprobe directed away from the joint line. Thermistor thermometers were placed perpendicularly at measured increments, and the freezing cycle was recorded until steady-state conditions were achieved. For 2 cortical samples, the probe was placed intramedullary in metaphyseal samples and measurements were performed radially from the central axis of each sample. Conductivity was calculated using Fournier's Law and then plotted against measured density of each sample. Across samples, density of cancellous bone ranged from 0.86 to 1.38 g/mL and average thermal conductivity ranged between 0.404 and 0.55 W/mK. Comparatively, cortical bone had a density of 1.70 to 1.86 g/mL and thermal conductivity of 0.0742 to 0.109 W/mK. A strong 2-degree polynomial correlation was seen (R =0.8226, P<.001). Bone is highly resistant to temperature flow. This resistance varies and inversely correlates strongly with density. This information is clinically relevant to maximize tumor ablation while minimizing morbidity through unnecessary bone loss and damage to surrounding structures. [Orthopedics. 201x; xx(x):xx-xx.].
File Format	HTM / HTML
ISSN	01477447
e-ISSN	19382367
Journal	Orthopedics
Language	English
Publisher	SLACK Incorporated
Publisher Date	2016-12-09
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Orthopedics Musculoskeletal
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Surgery

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