In-vitro comparison of biomechanical efficiency of three cannulated screws for arthrodesis of the hindfoot.

Abstract:

BACKGROUND:Sufficient inter-fragmentary compression is helpful to achieve successful bony fusion in hindfoot arthrodesis using internal fixation by screws. Beside bone quality, the design of a screw influences inter-fragmentary compression. Compressive force is achievable for any kind of screw system; however, the primary deformation of the bone is different for the different screw systems. The work necessary to achieve compressive force for primary stability was measured for different screw systems and compared to an AO screw with washer. MATERIALS AND METHODS:The compressive force was determined as a function of screw advancement for 3 different cannulated screw types (7.3-mm AO screw with and without washer, the 6.5-mm Herbert screw and the 6.5-mm Ideal Compression Screw (I.CO.S) using different synthetic bone density (0.16, 0.24, 0.48 g/ccm). Compressive force was measured indirectly, via screw tension measurement with strain gauges. RESULTS:We calculated the work to reach a limit of 60 N and the corresponding ratios to the value of the golden standard: I.CO.S (35.2%), Herbert (89.0%), AO screw without washer (116%). CONCLUSION:All screw systems yielded acceptable results but the ICOS did produce greater compression. The essential differences were the primary deformation of the bone before reaching the sufficient compressive force for primary stability.

journal_name

Foot Ankle Int

authors

Huber WO,Reihsner R,Trieb K,Wanivenhaus AH,Beer R

doi

10.3113/FAI.2008.0225

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

225-30

issue

2

eissn

1071-1007

issn

1944-7876

pii

965244

journal_volume

29

pub_type

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