Sigmoid perforation by broken nitinol memory frame after inguinal hernia repair.

Introduction: For an inguinal hernia repair, meshes with a continuous memory frame made it more easy to position the mesh in the preperitoneal space by anterior approach. We present a case of a sigmoid perforation caused by a fractured nitinol ring of a Rebound HRD Shield mesh.

Patients And Methods: A 29-years old sports instructor presented to the Emergency Department (ED) with a gnawing abdominal pain in the left lower quadrant. His past medical history noted an inguinal hernia repair on this side. A computed tomography scan showed a broken metal ring of the inguinal mesh perforating the sigmoid, so a laparoscopy was performed. The sigmoid was attached to the abdominal wall partially overlying the preperitoneal mesh and a part of the broken nitinol frame was found perforating the colon.

Results: The memory ring of the Rebound mesh is made of nitinol. An alloy well-known in vascular surgery for stenting arteries with high bending and compression forces. In this setting, fracture due to fatigue has already been described, but it is not known in abdominal wall reconstruction. Our patients groin was subject to daily bending and compression forces resulting in breakage of the nitinol ring.

Conclusion: Particularly in young athletic patients the nitinol ring will be subject to bending forces in the groin and prone to breakage. This can have potentially severe consequences given its location near abdominal organs and neurovascular structures. In our opinion, patients should be informed about the possibility of ring breakage and doctors should consider the risk-benefits well.