ArticleAnnals of vascular surgery2019
Length Redundancy and Twist Improve the Biomechanical Properties of Polytetrafluoroethylene Bypass Grafts.
Article in Annals of vascular surgery, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Supra-aortic bypass reconstructions using ring-reinforced 8 mm polytetrafluoroethylene for debranching before thoracic endovascular aortic repair and for atherosclerotic lesions of the subclavian artery.Journal of vascular surgery cases and innovative techniques · 2026Article
- Revisiting the tension-free paradigm: Axially prestretched elastomeric nanofibrillar grafts restore artery-like axial biomechanics in a preclinical model.Acta biomaterialia · 2026Article
- Tapered reinforced graft and vein cuff in the distal anastomosis as adjunct strategies for infrapopliteal prosthetic bypass graft in chronic limb-threatening ischemia: A case report.SAGE open medical case reports · 2023Article
Corrections and comments
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Authors and funding
6 authors.
Funding
Abstract
backgroundThe iliofemoropopliteal artery significantly changes path length during normal hip and knee flexion. Prosthetic bypass grafts, such as polytetrafluoroethylene (PTFE) grafts, are relatively stiff and thus can subject graft anastomoses to high tension when the path length increases. The aim of this study was to examine the influence of length redundancy and twist on the biomechanical properties of PTFE bypass grafts.
methodsUnreinforced and ring-reinforced PTFE grafts were loaded in an axial mechanical testing machine to measure the tensile and compressive axial forces with varying levels of length redundancy and axial twist.
resultsAdding 5-15% length redundancy to a graft decreases the force to cause 5% extension by > 90% without substantially increasing shortening forces. Adding 4.5°/cm of axial twist imparts a corkscrew shape to the graft without increasing extension or shortening forces in the presence of length redundancy. Ring-reinforced PTFE grafts require more length redundancy to experience these reductions in forces especially in the presence of axial twist.
conclusionsA modest amount of length redundancy and twist (i.e., a cork-screw condition) confers improved biomechanical properties in a PTFE graft, especially in ring-reinforced grafts. This should be taken into consideration when fashioning an arterial bypass graft in the iliofemoropopliteal segment.
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