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RA patients who once experienced a tendon rupture are still at risk of sequential tendon ruptures despite recent advancement of medical treatment. Education of the risks of sequential tendon ruptures and timely consultation to hand surgeons continue to be necessary in RA patients.

Although there was no significant difference in success rates between AL and PL points, PL is likely the best entry point. Although 30 degrees medial and approximately 5 degrees upward angulation led to the highest rate of successful screw placement, the rate was only around 80%. Given the wide individual variation, we recommend that a preoperative 3-dimensional CT scan be obtained when attempting atlantooccipital transarticular screw fixation.