Does cancellous screw insertion torque depend on bone mineral density and/or microarchitecture? Ab-Lazid, Rosidah Perilli, Egon Ryan, Melissa K Costi, John Jack Reynolds, Karen Jane 2014-02-25T02:26:53Z 2014-02-25T02:26:53Z 2014
dc.description This article appeared in a journal published by Elsevier Ltd. Under Elsevier's copyright, mandated authors are not permitted to make work available in an institutional repository. en
dc.description.abstract During insertion of a cancellous bone screw, the torque level reaches a plateau, at the engagement of all the screw threads prior to the screw head contact. This plateau torque (TPlateau) was found to be a good predictor of the insertion failure torque (stripping) and also exhibited strong positive correlations with areal bone mineral density (aBMD) in ovine bone. However, correlations between TPlateau and aBMD, as well as correlations between TPlateau and bone microarchitecture, have never been explored in human bone. The aim of this study was to determine whether TPlateau, a predictor of insertion failure torque, depends on aBMD and/or bone microarchitecture in human femoral heads. Fifty-two excised human femoral heads were obtained. The aBMD and microarchitecture of each specimen were evaluated using dual X-ray Absorptiometry and micro-computed tomography. A cancellous screw was inserted into specimens using an automated micro-mechanical test device, and TPlateau was calculated from the insertion profile. TPlateau exhibited the strongest correlation with the structure model index (SMI, R=−0.82, p<0.001), followed by bone volume fraction (BV/TV, R=0.80, p<0.01) and aBMD (R=0.76, p<0.01). Stepwise forward regression analysis showed an increase for the prediction of TPlateau when aBMD was combined with microarchitectural parameters, i.e., aBMD combined with SMI (R2 increased from 0.58 to 0.72) and aBMD combined with BV/TV and BS/TV (R2 increased from 0.58 to 0.74). In conclusion, TPlateau, a strong predictor for insertion failure torque, is significantly dependent on bone microarchitecture (particularly SMI and BV/TV) and aBMD. en
dc.description.sponsorship This work is funded by the National Health and Medical Research Council, Grand ID 595933. en
dc.identifier.citation Ab-Lazid R, Perilli E, Ryan MK, Costi JJ, Reynolds KJ. Does cancellous screw insertion torque depend on bone mineral density and/or microarchitecture?  Journal of Biomechanics.  2014:47;347-353 en
dc.identifier.doi en
dc.identifier.issn 0021-9290
dc.language.iso en en_US
dc.publisher Elsevier en
dc.relation en
dc.relation.grantnumber NHMRC/595933 en_US
dc.rights © 2013 Elsevier Ltd. All rights reserved. en_US
dc.rights.holder Elsevier. en_US
dc.subject Screw insertion en_US
dc.subject Plateau torque en_US
dc.subject Maximum torque en_US
dc.subject Bone mineral density en_US
dc.subject Microarchitecture en_US
dc.title Does cancellous screw insertion torque depend on bone mineral density and/or microarchitecture? en_US
dc.type Article en
local.contributor.authorOrcidLookup Costi, John Jack: en_US
local.contributor.authorOrcidLookup Reynolds, Karen Jane: en_US
local.contributor.authorOrcidLookup Perilli, Egon: en_US
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