What type of sEMG pattern is indicative of permanent injury?

The type of sEMG pattern that is indicative of permanent injury is characterized as continuous, non-accelerating tapping. This specific pattern suggests that there is a significant disruption in the neuromuscular pathway, which can be a result of severe nerve damage or trauma. Continuous activity in this context indicates that the muscle is perpetually activated, often reflecting a loss of normal nerve supply or chronic irritation of the nerve.

In contrast, other patterns exhibit different characteristics that do not necessarily point to permanent damage. Soft, intermittent flutter typically indicates a temporary dysfunction or irritation rather than an established injury, which might resolve if the underlying condition is addressed. Sustained nerve traction usually doesn’t manifest as an immediate continuous pattern but may show varying levels of muscle response or discomfort that could still allow for recovery if the traction is relieved. Intermittent jitter reflects a fluctuating activation of muscle fibers, often associated with issues like myasthenia gravis or other neuromuscular junction disorders, rather than a permanent injury standpoint.

In summary, the continuous, non-accelerating tapping pattern is specifically recognized as a signal of significant neuromuscular compromise, indicating the likelihood of permanent nerve injury, making it the correct choice in this context.