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. 2021 Jul 13;22:621. doi: 10.1186/s12891-021-04497-x

Fig. 9.

Fig. 9

The radiographs show the connection between plate of FNS and insertion handle by tightening of black screw. A The white arrow indicates the slit for connecting with plate. If the black screw is completely loosened with insertion hand, plate can be disconnected from insertion handle. B The white arrow means that plate slit is blocked by metal portion of black screw. If the black screw is tightened even a little, plate cannot be disconnected from handle. The photographs were taken by the authors