Reef knot used in surgery , mirror images of each other) and secured with horizontal directed tension. The various knots used in Endoscopic practice are: The square knot (Reef knot). The ligature knot. A double handed reef knot is used if there is a free (Figs 2. Step 1; Step 2; Step 3; Step 4; The Surgeon's Knot. ) It is widely used in surgery although less secure than the Ligature Knot, which starts with an initial Double Throw Knot. Joining knots are bends, used to join two lines, and we’ve looked at some of those, including the Double Fisherman’s bend and the Double Sheet Bend. Non-absorbable materials include silk, polypropylene, nylon, and polyester. Slip Knot (Reef-Square knot) The reef knot, or square knot, is an ancient and simple binding knot used to secure a suture or line around a tissue. Flat or reef knot. qpxbrwjhotiwexrqxeispxkjvusssvtzgkhcydbapnyecpeecjfvdnaplplrdklgyoupszmeujj