FEBRUARY 2018 Sub. Code: 2406
BACHELOR IN PROSTHETICS AND ORTHOTICS
FIRST YEAR
PAPER VI BIOMECHANICS I
Q.P. Code: 802406
Time: Three hours Maximum 100 Marks
Answer All questions
I. Elaborate on: x 10 30)
1. What are connective tissues? Discuss their mechanical properties?
2. Explain with the help of a diagram, kinematics of ankle joint during one gait cycle.
3. How many arches are present in the foot? What are their functions?
II. Write notes on: x 5 40)
1. Discuss advantages and disadvantages of surface EMG recording over needle
EMG?
2. What is vaulting? Discuss the reasons for vaulting in a transfemoral prosthesis
user.
3. Discuss first law of motion by citing an example?
4. Draw a labeled diagram and explain force elongation curve for connective tissue.
5. What do you understand by concentric contraction of a muscle? Explain with an
example.
6. Explain creep with an example?
7. Define degree of freedom? How many degrees of freedom does hand have? Show
them with the help of diagram.
8. Consider a weight lifter performing an exercise (Fig. to strengthen the biceps
muscle, which is located at a distance of a=1 cm from elbow joint. Assume that
combined center of mass of hand and weight is 100 N and is located at a distance
of b=7.5 cm from the elbow joint O. If the hand is held in horizontal position as
shown in the figure. Calculate the mechanical advantage if it is class 2 lever
system. What will be the direction of movement of the hand?
Figure 1
III. Short answers on: (10 x 3 30)
1. Define work. What is its SI unit and dimension?
2. Is acceleration a vector or a scalar quantity? Justify with an example.
3. What is hypomobility of a joint?
4. What is the purpose of recording EMG while performing gait analysis?
5. What are the different types of foot amputations? Briefly describe the
biomechanics of a prosthesis given for mid foot amputation? Draw diagram.
6. Consider the partial knee illustrated in the figure 2. The forces applied by
quadriceps FQ =12 N and patella tendon Fp 5 N respectively. Calculate the
magnitude and direction of the resultant force on the patella due to forces applied
by quadriceps and patella tendon.
Figure 2
7. If a trans tibial prosthetic user exerts 700 N against the ground during push off
phase of the gait, how much force will the ground exert on the person? Assume the
weight and height is 63Kg and 165cm respectively.
8. In which plane will you record movement of abduction and adduction of shoulder
or leg? Draw the corresponding plane showing this movement.
9. What do you mean by concurrent forces?
10. Why do you need conductive gel for surface EMG recording?