National Physical Therapy Examination (NPTE) Practice Exam

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What are the optimal parameters for electrical stimulation to address an extensor lag after knee arthroscopy?

Duty cycle of 50%; current intensity at 40% of maximal voluntary contraction; 20-minute treatment
Duty cycle of 20%; current intensity at 40% of maximal voluntary contraction; 20-minute treatment
Duty cycle of 20%; current intensity at 60% of maximal voluntary contraction; 10-minute treatment
Duty cycle of 50%; current intensity at 60% of maximal voluntary contraction; 10-minute treatment

The correct answer is: Duty cycle of 20%; current intensity at 60% of maximal voluntary contraction; 10-minute treatment

To address an extensor lag after knee arthroscopy, selecting the optimal parameters for electrical stimulation is essential for effective treatment. A suitable choice includes a duty cycle that allows for proper muscle contraction while minimizing fatigue, as well as an adequate current intensity that challenges the muscle sufficiently without causing discomfort. A duty cycle of 20% is ideal in this case because it allows for a longer rest period during the stimulation cycle, which promotes recovery and reduces the risk of muscle fatigue. This configuration is especially important for addressing muscle weakness post-surgery, where endurance and gradual strength building are crucial. Setting the current intensity at 60% of maximal voluntary contraction is significant as it provides enough stimulus to engage the muscle fibers effectively, encouraging strength gains and facilitating neuromuscular re-education after surgical intervention. For patients recovering from knee surgery, using a higher intensity can lead to better contraction and muscle activation, which is necessary to combat extensor lag. Additionally, a treatment duration of 10 minutes strikes a good balance, allowing for sufficient muscular engagement without excessive fatigue, which could occur with longer treatment sessions. It promotes compliance and maximizes the chances for muscle activation while minimizing discomfort. In summary, the parameters of a duty cycle of 20%, a current intensity at