Pre-op diagnosis: ossification of posterior longitudinal ligament (opll) and ossification of the yellow ligament (oyl) procedure: posterior thoracic decompression fusion levels of implant: th1-th12 it was reported that during surgery, a set screw could not be broken off.There was no space between the rod and the crosslink and it was closed so that the set screw could get in.The surgeon placed the crosslink and broke off a set screw on one side.When the surgeon tried to break off a set screw on the other side, torque could not be applied to the set screw and the set screw got into the thread of screw.The surgeon removed the screw using removal screw driver and tried it again with a new screw but same event occurred.The surgeon attempted to remove the setscrew that was successfully broken off first using removal screw driver but it was difficult to remove because the driver stripped.The surgeon judged that it did not need to be removed because it was tightly tightened, and the screw on the other side remained in the patient¿s body without breaking off.No patient complications were reported as a result of this surgery.
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