Does expanded polytetrafluoroethylene mesh really shrink after laparoscopic ventral hernia repair?

Area of Science:

• Surgical innovation
• Biomaterials science
• Medical imaging

Background:

• Mesh shrinkage is a suspected cause of hernia recurrence.
• Expanded polytetrafluoroethylene (ePTFE) is a unique mesh material visualized by CT scans.
• Animal studies suggest ePTFE contraction rates exceeding 40%, but human data is limited.

Purpose of the Study:

• To evaluate the in vivo shrinkage of ePTFE mesh after laparoscopic incisional/ventral hernia (LIVH) repair in humans.
• To compare human ePTFE mesh shrinkage rates with those reported in animal studies.
• To investigate potential factors influencing ePTFE mesh shrinkage, such as fixation methods and seroma formation.

Main Methods:

• A retrospective analysis of 815 LIVH repairs using ePTFE mesh (DualMesh Plus).
• Postoperative CT scans of 58 patients were analyzed for mesh dimensions using specialized software.
• Data on original mesh size, implantation duration, and seroma formation were collected and correlated with shrinkage.

Main Results:

• The mean ePTFE mesh shrinkage rate was 6.7%, significantly lower than animal study findings.
• No significant correlation was found between mesh shrinkage and original mesh size, implantation duration, or seroma presence.
• 27.5% of patients showed no detectable mesh shrinkage, with shrinkage ranging from 2.6-25% in others.

Conclusions:

• ePTFE mesh exhibits minimal shrinkage in human LIVH repairs.
• The use of transfascial sutures combined with tack fixation may reduce mesh contraction.
• Findings contrast with animal studies, suggesting ePTFE is a stable implant in this clinical setting.