Post on 14-Dec-2015
Type1 Misalignment
Characteristics
- C1 laterality on the same side of
angular rotation
- Contralateral acute angle
- Skull is parallel to vertical axis
- C1 is above parallel
Side of Laterality
Type2 Misalignment
Characteristics
- C1 laterality on the opposite side of
angular rotation
- Ipsilateral acute angle
- Skull is tipped toward vertical axis
- C1 remains fairly horizontal
- Laterality produced mainly by skull
Side of Laterality
Mainly by
Skull
Type3 Misalignment
Characteristics
- C1 laterality on the same side of
skull tipping
- No angular rotation
- C1 remains fairly horizontal
- Laterality produced by skull tipping
Side of Laterality
Directly by Skull
Type4 Misalignment
Characteristics
- C1 laterality on the same side of
angular rotation
- Contralateral acute angle
- Skull is tilted away from vertical axis
- C1 is above parallel
Side of Laterality
SUMMARY
Acute Angle
Cause
Type 1 Contralateral C1 Sideslip
Type 2 Ipsilateral Head tilt
Type 3 - Head tilt
Type 4 ContralateralC1 sideslip / Head tilt
How to Correct Misalignment?
Combination of the Head piece placement and Triceps pull
Patient placement is extremely crucial!
Using 3-D Xray (Lateral, Nasium, Vertex) to analyze how to set the patient on the table and specific correction vector.
C/A?
Condylar circle over Axial circle C/A is the specific vector which allows
both condylar circle and axial circle to rotate the same distance, but different speed.
C/A is unique to each individual Can be calculated. C/A=(A-C)/2
C/A?
Type 1
The vector is always higher than C/A in order to affect lower angle.
Type 2&3
The vector is always lower than C/A in order to affect head tilt.
Type 4
The vector is close to C/A because both lower angle and head tilt should be corrected at the same time.