A radially expandable stent-graft endoprosthesis is provided. The graft included
in the stent-graft is a knitted tubular structure circumferentially disposed and
securably attached to the stent. The knitted tubular structure has a knit pattern
of interlacing yarns in an Atlas or a modified-Atlas pattern to provide greater
than 150 percent longitudinal stretchability. A knitted tubular graft and a knitted
medical fabric with greater than 150 percent longitudinal stretchability are also provided.
