Detemination of several normal values were carried out in healthy 200 cases of Korean. adults,108 cases of male and 92 cases of females by the drawing and calculation on skull roentgengrams.
In many instances, the change of normal values provides an important clinical values and often is decisive to evaluate the diagnosis, treatment and prognosis of skull diseases.
The values are as follows.
1. To determine basilar invagination ;
A. Chamberlain´s line; the distance of odontoid process
B. McRae´s line; realation with the position of odontoid process
C. Method of Bull; The angle B in Fig. 3 is more than 13, the position of the odontoid process is abnormal
D. McGregor´s line; the distance of odontoid process
2. Basal angle to determine platybasia.
3. In sella turcica;
A. Depth
B. A-P diameter
C. Traseverse diameter
D. Volume
The results are as follows;
1. Chamberlain´s line; the distance betwern this line and upper margin of odontoid process;(mean) mate 1.02cm, female 0.67cm, total 0.91cm below the line.
2. McRae´s line: In all cases, the position of dontoid profess located below this line.
3. Method of Bull; (mean) male 7.34°, female 8.18°, total 7. 61°
4. McGregor´s line; the distance between this line and upper margin of odontid process; (mean) male 3.5mm, female 2.2mm, total 3. 1mm below this line.
2. Basal angle; (mean) male 131.32°, female 132.26°, total 131.62°
3. In sella turcica ; (mean)
A. Depth; male 1. 17cm, female 0.96cm, total 0.94c:n
B. A-P diameter; 1.31cm, female 1.25cm, total 1.29cm
C. Transverse diameter ; male 2.04cm, female 2.08cm, total 2.07 cm
D. Volume;
V=0.36xAxBxC
male 1126㎣, female 899㎣, total 904㎣
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