Comparative Study of AESCULAP Optilene® Mesh Elastic Versus Ethicon Ultrapro® Mesh in Incisional Hernia Repair

Inclusion Criteria: * Female or male patients \>=18 years * Female patients are incapable of pragnancy or must be using adequate contraception and are not in lactation * Patients wiht vertical aponeurotic incisions only * Incisional hernia with hernia size \>= 3 cm * Patient is capable to understand and to follow the instructions * written informed consent * no mesh implantation at the same site during a previous operation * immune competence of patient Exclusion Criteria: * Simultanous participation in an investigational drug or medical device study * Patients \< 18 years old * Incisional Hernia withe a hernia size \< 3 cm * Repair of an acute incarcerated hernia * Previous mesh repair at the same site * Patient with other than vertical aponeurotic incisions * Enterotomy to be performed during hernia repair at Surgery * Patient is on anti-coagulations-therapy * Patient is known or assessed to be non-compliant * Additional surgical treatment at the same time (e.g. cholecystectomy) * Immune incompetence of patient (e.g. chemotherapy)