NUCCA Biomechanics By Takanobu Nakaseko.

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Presentation transcript:

NUCCA Biomechanics By Takanobu Nakaseko

Review of Misalignment Types

Type1 Misalignment Side of Laterality 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 Side of Laterality Characteristics Mainly by Skull - 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 Mainly by Skull Side of Laterality

Type3 Misalignment Side of Laterality Directly by Skull Characteristics - C1 laterality on the same side of skull tipping - No angular rotation - C1 remains fairly horizontal - Laterality produced by skull tipping Directly by Skull Side of Laterality

Type4 Misalignment Side of Laterality 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 Type 2 Type 3 Type 4 Contralateral C1 Sideslip Type 2 Ipsilateral Head tilt Type 3 - Type 4 C1 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.

Head Piece A B C D

Mastoid Process 1 4 2/3

Mechanism of Head Piece Skull COG on the B

Mechanism of Head Piece Skull COG on the C

Mechanism of Head Piece Skull COG on the A

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? Condylar Circle Lever Axial Circle

C/A?

C/A? C/A

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.

Type 1 Correction

Type 1 Correction COG B

Type 2 Correction

Type 2 Correction COG D

Type 3 Correction

Type 3 Correction COG D

Type 4 Correction

Type 4 Correction COG C