[Theoretical-mathematical models of the forces effected by allograft sling systems in incontinence therapy].

The various allograft sling systems are differentiated by their devices, the different pore sizes of the prolene bands as well as, importantly, the various anatomical sling positions. Retropubic slings are positioned through the Retzius space, transobturator slings are placed through the obturator foramen. One of the major risks of complications when inserting these slings is that of over-tightening. The forces exerted during the positioning and fine tuning of the mesh slings are explained by a mathematical model. The flatter the suburethral angle after the tape placement, the stronger a force is to be applied for a further tightening of the tape. Due to the effective strength vectors, there seems to be less chance of overcorrection with the transobturator approach.