This creation is that a kind of vertebra flexibility rock-steady structure includes two bone nails, two ball-and-socket joints, two spherical extension bars and a flexible connection bar. Bone nail one end has external screw thread for locking vertebra, and the other end is removably equipped with circular arc pivot part, and ball-and-socket joint is for the pivot part and spherical extension bar fitting of bone nail, so that patient can still carry out activity a little in installing spinal fixing device Hou. Another longitudinally flexible connecting rod tool is flexible, and the spacing of each ball-and-socket joint is adjusted with screw thread limit means for flexible connection bar. Therefore this creation can each angle moderately adjust and have flexibility, reduce the influence on centrum joint biomechanics characteristic.本創作是一種脊椎撓性穩定結構包括二骨釘、二球窩接頭、二球狀接桿與一撓性連接桿。骨釘一端具有外螺紋供鎖入椎骨，另一端可拆卸地設有圓弧樞件，而球窩接頭供骨釘之樞件及球狀接桿套合，使得患者在裝設脊椎固定裝置後仍可進行微幅的活動。另縱向撓性連接桿具撓性，且撓性連接桿以螺紋限位手段可調節各球窩接頭的間距。故本創作可以各角度適度調整並具有撓性，降低對椎體骨節生物力學特性之影響。
