HTI2121 Neck Pain

8/3/2019 HTI2121 Neck Pain

1/16

Neck pain

xxxxxx

Project HT2121


2/16

General analysisMacroscopic view

Microscopic view

Case study

Global overview considering the problem as muscular

Objectives:

1. Identification of the muscles used to hold the head up.

2. Modelling of the situation by considering the main muscles.

3. Draw the free body diagram.4. Calculate the forces and moments.


3/16


Microscopic view

Case study

1. Identification of the muscles used to hold the head up:

According to the references, only the trapezius and the semispinalis acts as the main

muscle used to keep the head up. However, to simply the problem we will considerthese muscles as a group and therefore a unique force.

Sagittalplane Coronal plane


4/16


Microscopic view

Case study

2. Modelling of the situation by considering the main muscles:

Situation A Situation B Situation selected

Asumption: Position of the arm does not affected the neck position


5/16


Microscopic view

Case study

3. Free body diagram: The objective is to use the information

on muscles and positions to simplify the problem

Asumption: Position of the arm does not affected the neck position

x

y

+


6/16


Microscopic view

Case study

4. Calculations: The main obstacle will be to determine the

distance a by using the angles and and the distance c

(1)


7/16


Microscopic view

Case study

4. Calculations:

(2)

(3)


8/16


Microscopic view

Case study

Microscopic view considering the problem

as skeletal.

Remark: Same objectives as previously

Cervical vertebrae: C1 to C7


9/16

General analysisDefinition of the problem and modelling:

Cervical disc

Macroscopic view

Microscopic view

Case study

Realview Model Closer look


10/16

General analysisModelling and free body diagram:

Macroscopic view

Microscopic view

Case study


11/16


Microscopic view

Case study

Calculations: using the same principle as previously

Remark: In a first place, the muscle force or the joint force have to be known to determine

the numerical value of the force pressing on the cervical discs.


12/16


Microscopic view

Case study

A student, sat at his desk, is reading his ipad. He remains

still and straight on the coronal plane but his body and

neck are inclined on the sagittal plane. The Student feels

pain after a few hours in this position. What happened?

Situation for the case study:


13/16


Microscopic view

Case study

Equations found:

Macroscopic view:

Microscopic view:

Application of the previously found equation to a real case:


14/16


Microscopic view

Case study

Asumptions and numerical data:

The mass of the head is around 5 kg (Whead=50N)

The mass of the neck is around 1kg (Wneck=10N)

The attach point of the muscle is located 2cm away from the back of the head.

(b=2cm)

The center of gravity is located 15 cm away from the back of the head

(c+b=15cm then c=13cm)

The inclination angle of the spinal cord is around 5 (bta=10)

The inclination angle of the neck is around 25 (alpha=25)

The center of gravity of neck is located in the middle of its lenght (d=a=7cm)

The radius of a cervical disc is about 8 cm (m=8cm)

Application of the previously found equation to a real case:


15/16


Microscopic view

Case study

Calculations and conclusion

6 times the weight

of the head


16/16

References http://hypertextbook.com/facts/2006/DmitriyGekhman.shtml

http://www.uptodate.com/contents/patient-information-neck-pain

https://www.mylifestages.org/healthcenter/Articles.page?R=sw3-82385

http://athletics.wikia.com/wiki/Planes_of_Motion

http://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECH

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1166429/pdf/janat0019

0-0115.pdf http://www.physicsforums.com/showthread.php?t=139445
http://hypertextbook.com/facts/2006/DmitriyGekhman.shtmlhttp://www.uptodate.com/contents/patient-information-neck-painhttps://www.mylifestages.org/healthcenter/Articles.page?R=sw3-82385http://athletics.wikia.com/wiki/Planes_of_Motionhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC1166429/pdf/janat00190-0115.pdfhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC1166429/pdf/janat00190-0115.pdfhttp://www.physicsforums.com/showthread.php?t=139445http://www.physicsforums.com/showthread.php?t=139445http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1166429/pdf/janat00190-0115.pdfhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC1166429/pdf/janat00190-0115.pdfhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC1166429/pdf/janat00190-0115.pdfhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC1166429/pdf/janat00190-0115.pdfhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC1166429/pdf/janat00190-0115.pdfhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://articles.cnn.com/2011-02-01/tech/the.daily.peek_1_ipad-apple-s-app-store-top-stories?_s=PM:TECHhttp://athletics.wikia.com/wiki/Planes_of_Motionhttp://athletics.wikia.com/wiki/Planes_of_Motionhttps://www.mylifestages.org/healthcenter/Articles.page?R=sw3-82385https://www.mylifestages.org/healthcenter/Articles.page?R=sw3-82385https://www.mylifestages.org/healthcenter/Articles.page?R=sw3-82385https://www.mylifestages.org/healthcenter/Articles.page?R=sw3-82385http://www.uptodate.com/contents/patient-information-neck-painhttp://www.uptodate.com/contents/patient-information-neck-painhttp://www.uptodate.com/contents/patient-information-neck-painhttp://www.uptodate.com/contents/patient-information-neck-painhttp://www.uptodate.com/contents/patient-information-neck-painhttp://www.uptodate.com/contents/patient-information-neck-painhttp://www.uptodate.com/contents/patient-information-neck-painhttp://www.uptodate.com/contents/patient-information-neck-painhttp://hypertextbook.com/facts/2006/DmitriyGekhman.shtmlhttp://hypertextbook.com/facts/2006/DmitriyGekhman.shtml

HTI2121 Neck Pain

Documents

Transcript of HTI2121 Neck Pain