Abstract: A suture for facilitating tying of knots includes a length of suture material fixed to a needle. At least part of the length of the suture material is resiliently biased to a coiled state which is straightenable under applied tension but which returns to its coiled state when released. In use, part of the suture material is drawn through a region of tissue so that portions of the suture material lie on opposite sides of the tissue. A knot is then formed in the suture material by passing one of the portions through at least one resiliently-formed coil formed in the other of the portions, and pulling tight the suture material.