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Ergonomics & Musculoskeletal Disorder Prevention Flashcards

7 cards from real SSH practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which of the following is the MOST common work-related musculoskeletal disorder (WMSD) reported in U.S. workplaces?

    Answer: Low back pain

    Low back pain is the most prevalent work-related musculoskeletal disorder, accounting for the greatest number of lost workdays and workers' compensation costs in the U.S.

  2. According to NIOSH, which of the following is NOT one of the primary ergonomic risk factors for musculoskeletal disorders?

    Answer: High ambient temperature

    NIOSH identifies repetitive motion, awkward posture, contact stress, forceful exertion, vibration, and static posture as primary ergonomic risk factors; high ambient temperature is a thermal hazard, not a primary MSD risk factor.

  3. The Revised NIOSH Lifting Equation recommends a Recommended Weight Limit (RWL) for a two-handed manual lift. What is the load constant (LC) used as the starting point in this equation?

    Answer: 23 kg (51 lbs)

    The NIOSH Lifting Equation uses a load constant of 23 kg (51 lbs), which represents the maximum recommended weight under ideal lifting conditions.

  4. A Lifting Index (LI) value greater than what threshold indicates a significant risk of musculoskeletal injury according to the NIOSH Lifting Equation?

    Answer: LI > 1.0

    An LI greater than 1.0 indicates that the lifting task exceeds the recommended weight limit, signifying a significant risk of musculoskeletal injury for some workers.

  5. Which type of ergonomic intervention involves modifying the workstation, tools, or equipment to reduce MSD risk?

    Answer: Engineering control

    Engineering controls involve physical modifications to workstations, tools, or equipment—such as adjustable desks or ergonomic hand tools—and are preferred over administrative controls under the hierarchy of controls.

  6. Carpal tunnel syndrome is caused by compression of which nerve at the wrist?

    Answer: Median nerve

    Carpal tunnel syndrome results from compression of the median nerve as it passes through the carpal tunnel in the wrist, causing pain, numbness, and tingling in the hand.

  7. Which ergonomic assessment tool uses observable risk factor categories—such as neck, shoulder, and wrist posture—and assigns action levels to prioritize interventions?

    Answer: REBA (Rapid Entire Body Assessment)

    REBA (Rapid Entire Body Assessment) evaluates posture of the neck, trunk, upper and lower limbs, and assigns an action level score to guide the urgency of ergonomic intervention.