A kind of bolt structure is to be used for carrying out operation on ligament, including follow closely for the mother in setting one bone of what, which follows closely and have to form the external screw thread that mother follows closely outer peripheral surface, and forms the connection space that the what mother follows closely inside. The bolt structure of this case includes the son nail for having first connecting portion and second connecting portion again, which plugs the what connection space, and to enable son nail be flexibly connected with mother nail, and the second connecting portion system is for connecting a ligament. 一種螺釘結構，係供進行韌帶手術之用，包括供設置於一骨中之母釘，該母釘並具備形成於母釘外周面之外螺紋，以及形成於該母釘內部之連接空間。本案之螺釘結構復包括具備第一連接部及第二連接部之子釘，該第一連接部係插設於該連接空間，以令子釘與該母釘活動連接，而該第二連接部係供連接一韌帶。
