CIEE Biomechanics & Musculoskeletal Disorder Mechanisms 3

Question 1

What is the relationship between the frequency of repetitive motions and the risk of developing musculoskeletal disorders (MSDs)?

Accepted Answer

Higher frequency increases MSD risk, especially when combined with force and awkward posture

Answer

Higher frequency always reduces MSD risk by conditioning and strengthening tissues

Answer

Frequency alone has no established relationship to MSD risk

Answer

MSD risk depends only on peak force, not repetition frequency

Question 2

Which wrist position is considered 'neutral' and minimizes biomechanical stress on tendons and the median nerve?

Accepted Answer

Straight alignment with the forearm with minimal flexion, extension, or deviation

Answer

Maximum palmar flexion (wrist fully bent down)

Answer

Maximum dorsiflexion (wrist fully bent back)

Answer

Significant ulnar deviation (20-30 degrees toward the pinky side)

Question 3

What is De Quervain's tenosynovitis and which primary motion pattern causes it?

Accepted Answer

Inflammation of the abductor pollicis longus and extensor pollicis brevis tendons caused by repetitive thumb and radial deviation movements

Answer

Inflammation of carpal tunnel flexor tendons caused by ulnar deviation

Answer

Median nerve compression at the wrist caused by repetitive power gripping

Answer

Inflammation of the median nerve sheath caused by sustained wrist flexion

Question 4

The Borg CR-10 scale is used in ergonomic job analysis primarily to measure what?

Accepted Answer

Subjective perceived exertion and physical effort during work tasks

Answer

Lumbar compression forces in Newtons

Answer

Grip and pinch strength in kilograms

Answer

Heart rate response during standardized lifting tasks

Question 5

What does 'cumulative trauma disorder' (CTD) describe in the context of occupational musculoskeletal health?

Accepted Answer

A progressive musculoskeletal disorder resulting from repeated micro-trauma over time without adequate tissue recovery

Answer

A single acute injury caused by one traumatic event such as a fall

Answer

A disorder caused exclusively by whole-body vibration exposure

Answer

A genetic predisposition to musculoskeletal injury unrelated to work exposures

Question 6

In static loading assessment, which factor is most critical to evaluate when a worker holds a tool or part in a fixed position for extended periods?

Accepted Answer

The duration of continuous static muscle contraction

Answer

The color and reflectance of the tool surface

Answer

The ambient temperature of the immediate work environment

Answer

The educational background and training level of the worker

Question 7

According to biomechanical principles, which lifting technique minimizes lumbar spine compressive forces when lifting a compact, close-contact load?

Accepted Answer

Power zone lift (load held close to body between mid-thigh and mid-chest height)

Answer

Stoop lift (back bent forward, knees straight throughout lift)

Answer

Wide-stance deep squat lift with load held at arm's length

Answer

Overhead lift with arms fully extended above shoulder height