Fully threaded sacroiliac lag screws have higher load to failure when compared to partially threaded screws: A biomechanical study.
Fully threaded
Lag screw
Partially threaded
Pelvic ring
Sacral
Trans-iliac
Trans-sacral
Journal
Journal of clinical orthopaedics and trauma
ISSN: 0976-5662
Titre abrégé: J Clin Orthop Trauma
Pays: India
ID NLM: 101559469
Informations de publication
Date de publication:
Historique:
received:
19
08
2020
revised:
15
10
2020
accepted:
15
10
2020
entrez:
16
11
2020
pubmed:
17
11
2020
medline:
17
11
2020
Statut:
ppublish
Résumé
The purpose of this study is to compare biomechanical properties of fully and partially threaded iliosacral screws. We hypothesise that fully threaded screws will have a higher yield force, and less deformation than partially threaded screws following axial loading. Twenty sawbone blocks were uniformly divided to simulate vertical sacral fractures. Ten blocks were affixed with fully threaded iliosacral screws in an over-drilled, lag-by-technique fashion whilst the remaining ten were fixed with partially threaded lag-by-design screws. All screws measured 7.3-mm x 145 mm, and were inserted to a 70% of calculated maximal insertional torque, ensuring uniform screw placement throughout across models. Continuous axial loads were applied to 3 constructs of each type to failure to determine baseline characteristics. Five hundred loading cycles of 500 N at 1 Hz were applied to 4 constructs of each type, and then axially loaded to failure. Force displacement curves, elastic, and plastic deformation of each construct was recorded. Fully threaded constructs had a 428% higher yield force, 61% higher stiffness, 125% higher ultimate force, and 66% lower yield deformation (p < 0.05). The average plastic deformation for partially threaded constructs was 336% higher than fully threaded constructs (p = 0.071), the final elastic deflection was 10% higher (p = 0.248), and the average total movement was 21% higher (p = 0.107). We conclude from this biomechanical study that fully threaded, lag-by-technique iliosacral screws can withstand significantly higher axial loads to failure than partially threaded screws. In addition, fully threaded screws trended towards exhibiting a significantly lower plastic deformation following cyclical loading.
Identifiants
pubmed: 33192022
doi: 10.1016/j.jcot.2020.10.035
pii: S0976-5662(20)30504-X
pmc: PMC7656480
doi:
Types de publication
Journal Article
Langues
eng
Pagination
1151-1157Informations de copyright
© 2020 Delhi Orthopedic Association. All rights reserved.
Déclaration de conflit d'intérêts
One or more of the authors report personal fees outside of the submitted work.
Références
Arch Orthop Trauma Surg. 2006 Jan;126(1):49-52
pubmed: 16311761
J Orthop Trauma. 1996;10(8):517-22
pubmed: 8915911
J Trauma. 1991 Jan;31(1):28-31
pubmed: 1986129
Foot Ankle Int. 2000 Oct;21(10):849-51
pubmed: 11128016
Arch Orthop Trauma Surg. 2016 Jul;136(7):921-7
pubmed: 27168134
J Orthop Trauma. 1993;7(2):138-41
pubmed: 8459298
Injury. 1994 Oct;25(8):515-7
pubmed: 7960068
Injury. 2016 Jul;47(7):1569-73
pubmed: 27126768
J Biomech. 1968 Dec;1(4):279-302
pubmed: 16329432
J Foot Ankle Surg. 2015 Nov-Dec;54(6):1021-4
pubmed: 26210079
Ann Biomed Eng. 2008 Mar;36(3):415-24
pubmed: 18204902
Clin Orthop Relat Res. 1975 Sep;(111):257-62
pubmed: 1157420
J Orthop Trauma. 2013 Apr;27(4):232-5
pubmed: 23114416
J Orthop Trauma. 2010 Jun;24(6):374-8
pubmed: 20502221
J Orthop Trauma. 2007 Feb;21(2):117-23
pubmed: 17304067
Instr Course Lect. 2004;53:375-85
pubmed: 15116628
J Hand Surg Am. 1995 Nov;20(6):1021-7
pubmed: 8583051
Can J Surg. 1990 Dec;33(6):492-4
pubmed: 2253128
J Orthop Trauma. 2003 Jul;17(6):399-405
pubmed: 12843722
Injury. 1996;27 Suppl 1:S-A13-20
pubmed: 8762338
J Orthop Surg Res. 2018 Jun 19;13(1):152
pubmed: 29914519
J Biomech Eng. 1996 Aug;118(3):391-8
pubmed: 8872262
Injury. 2005 Jan;36(1):1-13
pubmed: 15589906
Geriatr Orthop Surg Rehabil. 2011 May;2(3):86-9
pubmed: 23569675
J Orthop Trauma. 1998 Mar-Apr;12(3):145-50; discussion 150-1
pubmed: 9553853