CIEE Biomechanics & Musculoskeletal Disorder Mechanisms 2

Question 1

Which condition is characterized by inflammation of the tendons attaching the forearm muscles to the lateral epicondyle of the elbow?

Accepted Answer

Lateral epicondylitis (tennis elbow)

Answer

Carpal tunnel syndrome

Answer

De Quervain's tenosynovitis

Answer

Trigger finger (stenosing tenosynovitis)

Question 2

What effect does maintaining a forward-flexed trunk posture have on spinal disc pressure compared to standing upright?

Accepted Answer

Increases disc pressure significantly due to greater moment arm

Answer

Decreases disc pressure by approximately 50%

Answer

Has no clinically significant effect on disc pressure

Answer

Reduces compressive forces by activating abdominal muscles

Question 3

Which nerve is compressed in carpal tunnel syndrome, causing numbness and tingling in the hand?

Accepted Answer

Median nerve

Answer

Ulnar nerve

Answer

Radial nerve

Answer

Musculocutaneous nerve

Question 4

What does the NIOSH lifting equation directly calculate as its primary output for assessing a lifting task?

Accepted Answer

Recommended Weight Limit (RWL)

Answer

Maximum Moment Load (MML)

Answer

Acceptable Compression Index (ACI)

Answer

Biomechanical Strain Ratio (BSR)

Question 5

What is the primary biomechanical mechanism by which intra-abdominal pressure (IAP) assists the spine during heavy lifting?

Accepted Answer

It creates an internal pressure cylinder that reduces net spinal compressive loading

Answer

It increases heart rate to supply more oxygen to spinal muscles

Answer

It directly strengthens quadriceps and hip extensor muscles

Answer

It decreases the perceived weight of the object being lifted

Question 6

Which type of muscle contraction occurs when a muscle develops tension while its length remains constant, such as holding a part stationary?

Accepted Answer

Isometric contraction

Answer

Isotonic concentric contraction

Answer

Isotonic eccentric contraction

Answer

Isokinetic contraction

Question 7

What is the primary risk factor for developing rotator cuff disorders in workers performing sustained overhead tasks?

Accepted Answer

Sustained shoulder elevation above 60 degrees causing subacromial impingement

Answer

High ambient temperature above 85°F

Answer

Insufficient workplace lighting below 50 foot-candles

Answer

High ambient noise levels above 85 dB