Week 7: Introduction to Modelling

Question 1

Why do we model body segments?

Answer 1

Anatomy is highly complex, modelling as an attempt of representing reality by simplifying the system.

Question 2

What information is required to create a model?

Answer 2

• Knowledge of the system of interest

- Experimental Data

Question 3

What Knowledge of a system would you need to have to develop a model?

Answer 3

Anatomy and understanding of the muscle groups across a joint- this will help justify assumptions such as can joint movement be assumed two dimensional?

Question 4

What Experimental data would you need to know to develop a model?

Answer 4

Joint angles involved in motion.

Ground reaction forces and external measures of joint angle

The interaction between two segments

Question 5

Give three assumptions made when creating models

Answer 5

1. The movement occurs in two dimensions
2. The segments are rigid and have constant geometry
3. The movement is frictionless and there is no translation

Question 6

What is the purpose of modelling?

Answer 6

Estimating muscle force or internal joint force

predictions around injury and adjustments to reduce injury risk

Question 7

What is the difference between a direct model and an indirect model?

Answer 7

A direct model introduces a cause and developed the effect of the cause on movement whereas the inverse model observes the effect and considers potential causes.

(Inverse is more common)

Question 8

How might a model be validated?

Answer 8

By comparing the model estimations against direct measurements.