Jing L, et al. - In occipitocervical fusion patients, researchers evaluated the accuracy of screw placement and clinical outcomes. Retrospectively reviewing patients who underwent occipitocervical fusion with O-arm-based navigation between January 2015 and December 2017, they noted that for treating instability of craniovertebral junction, the procedure was effective and safe. Observations revealed the optimal accuracy rate of 88.41% (61 of 69 screws) in the first 15 patients and 98.57% (69 of 70 screws) in the subsequent 15 patients. Surgeons could insert screws accurately in assistance of intraoperative navigation.