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Copyright ©2014 Baishideng Publishing Group Inc.
World J Orthop. Jul 18, 2014; 5(3): 292-303
Published online Jul 18, 2014. doi: 10.5312/wjo.v5.i3.292
Table 1 Criteria for cranial settling in rheumatoid
Measurement/CriteriaDescriptionDefinition of abnormal
McRae’s lineTip of the basion to opisthionIf any portion of the odontoid extends superior to this line
McGregor’s lineHard palate to caudal aspect of the opisthion> 4.5 mm of the dens is superior to this line
Chamberlain’s lineHard palate to the midpoint of the opisthion> 3 mm of the dens extends superior to this line
Ranawat’s1Distance from the C2 pedicle to a line bisecting the ring of C1< 15 mm in males, < 13 mm in females
Redlund-Johnell and Peterson1Distance from the inferior end plate of C2 to McGregor’s palato-occipital line< 34 mm in males, < 29 mm in females
Clark’s station of the atlas1Position of C1 with relation to the body of C2 (divided into thirds)If C1 extends below the rostral third of C2
Table 2 Common rheumatoid arthritis medications and perioperative considerations
RA medicationPreoperative action
NSAIDsDiscontinue 3-5 half-lives before surgery
CorticosteroidsAdminister perioperative stress doses
MethotrexateDiscontinue for 6-8 wk if possible
Biologic agents (TNF-α and interleukin-1 antagonists)Discontinue preoperatively and hold until 10-14 d post-surgery