Which statements about cumulative trauma disorders are true? I. risk of CTDs is associated with highly repetitive use of the same body part. II. damage from CTDs is usually noticed by workers within 24 hours of the activity. III. CTDs may affect tendons, tendon sheaths, soft tissue, nerves, bones, and spinal vertebrae. IV. high repetitiveness is defined as a cycle time of less than one minute. V. leaning over a workbench and resting the forearm on a hard edge or surface may lead to carpal tunnel.

Which statements about cumulative trauma disorders are true? I. risk of CTDs is associated with highly repetitive use of the same body part. II. damage from CTDs is usually noticed by workers within 24 hours of the activity. III. CTDs may affect tendons, tendon sheaths, soft tissue, nerves, bones, and spinal vertebrae. IV. high repetitiveness is defined as a cycle time of less than one minute. V. leaning over a workbench and resting the forearm on a hard edge or surface may lead to carpal tunnel.

• A. I and II
• B. I and III
• C. II, IV, and V
• D. III, IV, and V

Answer: (B)

Cumulative trauma disorders arise from tissue damage caused by repeated, often high-frequency use of the same body part. That idea makes sense why the true statements are the ones that say the risk is linked to highly repetitive activity and that CTDs can involve a range of tissues. Specifically, CTDs may affect tendons and their sheaths, soft tissue, nerves, bones, and even spinal vertebrae, reflecting how multiple structures can be involved when stresses accumulate over time. Symptoms from CTDs aren’t typically noticed within a day or two; they develop gradually after prolonged exposure, which is why the claim about being noticed within 24 hours isn’t reliable. The notion that high repetitiveness is defined by a cycle time of less than one minute isn’t a standard or precise criterion for defining CTD risk, so that statement isn’t considered correct. As for leaning over a workbench with the forearm resting on a hard edge, carpal tunnel is mainly related to pressure and posture at the wrist itself during repetitive hand use, not simply this forearm posture, so that factor isn’t a typical direct cause described in this context. So, the statements that reflect the true concept are the ones describing repetitive use across multiple tissues, making the best answer the one that includes I and III.

Cumulative trauma disorders arise from tissue damage caused by repeated, often high-frequency use of the same body part. That idea makes sense why the true statements are the ones that say the risk is linked to highly repetitive activity and that CTDs can involve a range of tissues. Specifically, CTDs may affect tendons and their sheaths, soft tissue, nerves, bones, and even spinal vertebrae, reflecting how multiple structures can be involved when stresses accumulate over time.

Symptoms from CTDs aren’t typically noticed within a day or two; they develop gradually after prolonged exposure, which is why the claim about being noticed within 24 hours isn’t reliable.

The notion that high repetitiveness is defined by a cycle time of less than one minute isn’t a standard or precise criterion for defining CTD risk, so that statement isn’t considered correct.

As for leaning over a workbench with the forearm resting on a hard edge, carpal tunnel is mainly related to pressure and posture at the wrist itself during repetitive hand use, not simply this forearm posture, so that factor isn’t a typical direct cause described in this context.

So, the statements that reflect the true concept are the ones describing repetitive use across multiple tissues, making the best answer the one that includes I and III.