CES Human Anatomy & Biomechanics 2

Question 1

In the NIOSH Lifting Equation, what does the load constant (LC) represent?

Accepted Answer

Weight under ideal lifting conditions (23 kg)

Answer

The NIOSH load constant of 23 kg (51 lb) represents the maximum recommended load weight under ideal lifting conditions.

Question 2

Which joint in the upper extremity is most vulnerable to cumulative trauma from repetitive overhead work?

Accepted Answer

Shoulder (glenohumeral)

Answer

The glenohumeral joint has a wide range of motion but minimal bony stability, making the rotator cuff tendons highly susceptible to impingement during overhead tasks.

Question 3

What is 'ulnar deviation' of the wrist?

Accepted Answer

Bending wrist toward the pinky side

Answer

Ulnar deviation is lateral flexion of the wrist toward the ulna (pinky side) and is a common risk factor for carpal tunnel syndrome.

Question 4

Which nerve is compressed in cubital tunnel syndrome?

Accepted Answer

Ulnar nerve

Answer

Cubital tunnel syndrome involves compression of the ulnar nerve at the elbow, causing numbness in the ring and pinky fingers.

Question 5

What does 'moment arm' refer to in biomechanics?

Accepted Answer

The perpendicular distance from a joint to the line of force

Answer

The moment arm is the perpendicular distance from the joint axis to the line of action of the force, determining the torque produced.

CES - Certified Ergonomic Specialist Practice Test

CES - Certified Ergonomic Specialist Practice Test

CES Human Anatomy & Biomechanics 2