National Physical Therapy Examination (NPTE) Quiz: Therapeutic Modality Selection
20 questions · exam conditions
0:00
Therapeutic Modality SelectionQuestion 1 of 20

A 52-year-old patient presents with chronic Achilles tendinosis. A recent radiograph confirms the presence of calcific deposits within the tendon. The physical therapist decides to use iontophoresis to address the calcification. The patient's medical history includes a known allergy to aspirin. Which of the following treatment parameters is MOST appropriate?

Dexamethasone with a current delivered from the negative electrode.
Lidocaine with a current delivered from the positive electrode.
Acetic acid with a current delivered from the negative electrode.
Sodium salicylate with a current delivered from the negative electrode.
← Back to quizzes

National Physical Therapy Examination (NPTE) Quiz

National Physical Therapy Examination (NPTE) Quiz: Therapeutic Modality Selection

Practice Therapeutic Modality Selection in National Physical Therapy Examination (NPTE) with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Therapeutic Modality Selection, giving you a quick way to practice the rules, question types, and explanations that matter most for National Physical Therapy Examination (NPTE).

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

A 52-year-old patient presents with chronic Achilles tendinosis. A recent radiograph confirms the presence of calcific deposits within the tendon. The physical therapist decides to use iontophoresis to address the calcification. The patient's medical history includes a known allergy to aspirin. Which of the following treatment parameters is MOST appropriate?

  1. Dexamethasone with a current delivered from the negative electrode.
  2. Lidocaine with a current delivered from the positive electrode.
  3. Acetic acid with a current delivered from the negative electrode. (correct answer)
  4. Sodium salicylate with a current delivered from the negative electrode.
Explanation: The correct choice requires three steps of reasoning: 1) Identify the target condition, which is calcific deposits, not just inflammation. Acetic acid is specifically used to increase the solubility of calcium deposits. 2) Identify the correct polarity for the selected medication. Acetic acid is a negative ion and is therefore delivered from the negative electrode (cathode). 3) Screen for contraindications. The patient has an aspirin allergy, which is a contraindication for the use of sodium salicylate, as they are both salicylates. A: Dexamethasone is a corticosteroid used for inflammation and is delivered from the negative electrode, but it does not directly address calcific deposits. B: Lidocaine is a local anesthetic used for pain and is delivered from the positive electrode; it is not indicated for this condition. D: Sodium salicylate is an anti-inflammatory medication, but it is contraindicated in patients with an aspirin allergy.

Question 2

A 60-year-old patient, 8 weeks status post-rotator cuff repair, presents with significant capsular adhesions and restricted glenohumeral external rotation. The therapist's goal is to increase the extensibility of the deep posterior capsule before manual stretching. The patient's BMI is 32, resulting in a thick layer of overlying soft tissue. Which ultrasound parameters are MOST appropriate to achieve this goal?

  1. 1 MHz, continuous (100% duty cycle), at 1.5 W/cm². (correct answer)
  2. 3 MHz, continuous (100% duty cycle), at 1.0 W/cm².
  3. 1 MHz, pulsed (20% duty cycle), at 0.8 W/cm².
  4. 3 MHz, pulsed (50% duty cycle), at 1.2 W/cm².
Explanation: The correct answer requires synthesizing three pieces of information: treatment goal, tissue depth, and desired physiological effect. 1) The goal is to increase tissue extensibility, which requires thermal effects. This necessitates a continuous (100% duty cycle) ultrasound application. 2) The target tissue is the deep posterior shoulder capsule, and the patient has a high BMI, indicating a thick overlying tissue layer. A frequency of 1 MHz is required to penetrate deep tissues (up to 5 cm). 3) The intensity of 1.5 W/cm² is appropriate for generating thermal effects in deep tissue. B: A frequency of 3 MHz is used for superficial tissues (1-2 cm) and would not effectively heat the deep posterior capsule. C: A pulsed duty cycle of 20% produces non-thermal effects, which are used for tissue healing and inflammation control, not for increasing tissue extensibility. D: A frequency of 3 MHz is for superficial tissue, and a 50% duty cycle provides only mild thermal effects, which would be insufficient for the stated goal.

Question 3

A 48-year-old female patient presents with deep, right-sided buttock pain consistent with chronic piriformis syndrome. The therapist determines that a deep heating modality is appropriate to increase tissue extensibility before stretching. The patient's medical history includes the use of a copper intrauterine device (IUD) for contraception, inserted 2 years ago. Which statement regarding the use of shortwave diathermy is MOST accurate?

  1. Continuous shortwave diathermy is indicated to maximize thermal effects on the piriformis muscle.
  2. Diathermy is contraindicated due to the presence of the copper IUD within the potential treatment field. (correct answer)
  3. Pulsed shortwave diathermy can be used safely as it produces non-thermal effects.
  4. Diathermy can be used if the treatment drum is placed anteriorly over the hip flexors to avoid the IUD.
Explanation: The presence of metal, including a copper IUD, within the treatment field is an absolute contraindication for continuous shortwave diathermy due to the risk of concentrating the energy and causing a deep tissue burn. The piriformis muscle is located deep in the gluteal region, placing a pelvic IUD directly in the path of the electromagnetic field. A: This choice is incorrect because it ignores the absolute contraindication. C: While pulsed shortwave diathermy (PSWD) can be used with metal implants under certain low-intensity, non-thermal protocols, significant precautions remain, and it is still often considered a relative contraindication. Given the absolute contraindication for the thermal application, B is the most accurate and safest statement. D: Placing the drum anteriorly would not heat the target piriformis muscle and does not guarantee that the electromagnetic field will not reach the IUD.

Question 4

A 65-year-old patient with post-herpetic neuralgia affecting the T8 dermatome reports constant, severe burning pain (8/10). The patient has been using a conventional, high-frequency transcutaneous electrical nerve stimulation (TENS) unit for 2 weeks with minimal relief. The physical therapist plans to adjust the TENS parameters to better manage this type of chronic neuropathic pain. Which parameter set is the MOST appropriate next step?

  1. Continue with high-frequency TENS but increase the amplitude to produce a strong, non-painful tingling sensation.
  2. Switch to a low-frequency (2-10 pps), high-intensity (to visible motor twitch) protocol. (correct answer)
  3. Switch to a burst mode setting with a high frequency within the bursts and a low burst rate.
  4. Decrease the pulse duration to less than 50 microseconds to make the stimulation more comfortable.
Explanation: Chronic neuropathic pain that is unresponsive to conventional (high-frequency) TENS may respond better to a modality that stimulates endogenous opioid release. Low-frequency, high-intensity TENS, often called acupuncture-like TENS, is theorized to work through this mechanism. This requires setting a low pulse rate (2-10 pps) and an intensity high enough to elicit a visible, non-painful muscle twitch. A: Simply increasing the intensity of a failed modality is unlikely to be effective if the underlying mechanism of action (gate control theory) is not working for this patient's pain type. C: Burst mode is a hybrid that can stimulate opioid release, but switching directly to low-frequency TENS is a more distinct and standard change in the mechanism of action. D: Decreasing the pulse duration would make the stimulation less effective at recruiting nerve fibers and is the opposite of what is typically needed for motor-level stimulation.

Question 5

A 62-year-old female with Stage 2 lymphedema of the left lower extremity is referred for treatment. Her medical history is significant for stable, compensated congestive heart failure (CHF) with a left ventricular ejection fraction of 45%. The therapist is considering the use of intermittent pneumatic compression (IPC). What is the MOST appropriate course of action?

  1. Withhold IPC as any history of CHF is an absolute contraindication due to risk of fluid overload.
  2. Initiate IPC at a pressure of 70 mmHg to effectively reduce the lymphedema.
  3. Proceed with IPC after consulting the referring physician, using low pressure and monitoring for systemic effects. (correct answer)
  4. Apply the IPC pump to both lower extremities simultaneously to balance fluid return to the heart.
Explanation: Unstable or uncompensated CHF is an absolute contraindication for IPC. However, stable/compensated CHF is a relative contraindication/precaution. IPC will shift a significant fluid volume from the periphery to the central circulation, which could potentially overwhelm a compromised heart. The most appropriate and safest action is to first consult with the referring physician. If approved, the intervention should be initiated cautiously with low pressures and close monitoring for signs of fluid overload (e.g., dyspnea, crackles on auscultation, jugular venous distention). A: This is incorrect; stable CHF is a relative, not absolute, contraindication. B: Initiating IPC at a high pressure without physician clearance and monitoring is unsafe. D: Applying IPC to both legs would create an even larger fluid shift and significantly increase the risk.

Question 6

A 50-year-old patient reports diffuse, poorly localized pain described as a deep ache across the entire lumbar region, including the bilateral paraspinals from L1 to S1. The therapist wants to apply an electrical modality for sensory-level pain modulation over this large area. Which modality and setup would be the MOST effective choice?

  1. Quadripolar interferential current (IFC) with electrodes placed to cross over the central area of pain. (correct answer)
  2. A single channel of conventional high-frequency TENS with electrodes placed parallel to the spine.
  3. Low-frequency, acupuncture-like TENS with electrodes placed over the L4 and L5 paraspinal motor points.
  4. High-voltage pulsed current (HVPC) with the active electrode over the point of maximal tenderness.
Explanation: The key clinical features are a large, diffuse, and deep pain area. Interferential current (IFC) uses two medium-frequency currents that 'interfere' to create a lower-frequency therapeutic current in the tissues. This allows for deeper penetration with less skin impedance and is ideal for treating large, diffuse areas of pain, making it superior to TENS in this scenario. A quadripolar (4-electrode) setup is standard for creating this interference pattern. B: Conventional TENS is effective, but a single channel would provide more localized treatment and would be less effective for this large, diffuse area. C: Acupuncture-like TENS targets a different pain relief mechanism (opiate release) and is typically applied to specific motor or acupuncture points, not for broad sensory modulation. D: HVPC is primarily used for wound healing, edema reduction, and muscle stimulation, and is less commonly used for sensory pain modulation compared to IFC or TENS.

Question 7

An 82-year-old female with severe, chronic osteoarthritis in both hands reports debilitating morning stiffness and pain. Her medical history includes diabetic peripheral neuropathy, and sensory testing reveals significantly diminished sensation to temperature and light touch in her fingers. She lives alone. Which of the following is the MOST appropriate recommendation regarding a home heating modality?

  1. Recommend a home paraffin wax unit with instructions to limit dips to 4-5 times.
  2. Advise against unsupervised use of heat and recommend gentle active exercises in warm water. (correct answer)
  3. Suggest a microwaveable moist heat pack, advising her to test the temperature on her forearm first.
  4. Prescribe an electric heating pad with an automatic shut-off feature to be used on the lowest setting.
Explanation: This is a safety-critical question. The patient has two major risk factors for a thermal injury: significantly impaired sensation due to diabetic neuropathy and living alone, which means an injury may not be noticed quickly. All forms of applied heat (paraffin, hot packs, heating pads) carry a high risk of burns in this scenario. The most appropriate and prudent recommendation is to advise against these modalities and suggest a safer alternative. Gentle active range of motion in warm (not hot) water provides the benefits of warmth and movement without the concentrated, passive heat application that poses a burn risk. A, C, D: All of these options, despite suggested precautions, still present an unacceptably high risk of a burn given the patient's severe sensory loss and social situation.

Question 8

A patient with chronic patellar tendinopathy is receiving iontophoresis with dexamethasone. After the third session, the patient reports no change in symptoms but notes the development of several small, pustule-like lesions under the area of the active electrode. The therapist identifies the active electrode as the cathode. What is the MOST likely cause and appropriate response?

  1. An acidic reaction under the anode; the therapist should decrease the current intensity.
  2. An allergic reaction to the dexamethasone; the therapist should switch to a different anti-inflammatory medication.
  3. Folliculitis from poor skin preparation; the therapist should cleanse the area with an alcohol wipe before the next session.
  4. An alkaline reaction under the cathode; the therapist should discontinue iontophoresis and clean the skin. (correct answer)
Explanation: When you encounter iontophoresis complications on the NPTE, focus on the electrochemical reactions occurring at each electrode. Understanding these reactions is crucial for identifying adverse effects and responding appropriately. The pustule-like lesions under the cathode (negative electrode) indicate an alkaline chemical burn. During iontophoresis, water electrolysis occurs at both electrodes: the cathode produces hydroxide ions (OH⁻), creating a highly alkaline environment with a pH around 11-12. This alkaline reaction can cause severe skin irritation, chemical burns, and the pustule-like lesions described. The correct response is immediate discontinuation and thorough skin cleansing, making option D correct. Option A incorrectly identifies the electrode chemistry—acidic reactions occur at the anode (positive electrode), not where the lesions appeared. Simply decreasing current intensity won't address the chemical burn that has already occurred. Option B misidentifies the cause as an allergic reaction to dexamethasone. Allergic reactions typically present as widespread redness, itching, or hives, not localized pustules specifically under the electrode. The location and appearance strongly suggest chemical irritation rather than drug allergy. Option C suggests folliculitis from poor preparation, but folliculitis doesn't typically develop this rapidly or in such a specific pattern. The distinct location under the cathode points to electrochemical causation rather than bacterial infection. Remember this pattern: pustule-like lesions under electrodes during iontophoresis almost always indicate chemical burns from pH changes. Always discontinue treatment immediately and document the adverse reaction thoroughly.

Question 9

A 42-year-old patient is in the subacute stage of Type 1 Complex Regional Pain Syndrome (CRPS) affecting the right hand. The hand exhibits significant allodynia, hyperalgesia, and fluctuating skin temperature and color. The therapist is considering using a contrast bath to address the vasomotor instability. What is the MOST appropriate clinical decision?

  1. Initiate the contrast bath using large temperature gradients (43°C hot, 10°C cold) to maximize the vascular response.
  2. Defer the contrast bath due to severe sensory hypersensitivity and begin with graded motor imagery. (correct answer)
  3. Begin the contrast bath using only mild temperature differences (38°C warm, 25°C cool) to acclimate the patient.
  4. Use fluidotherapy at a high temperature instead of the contrast bath to promote vasodilation and desensitization.
Explanation: While contrast baths are sometimes used for CRPS to address vasomotor dysfunction, their appropriateness depends on the patient's sensory symptoms. The presence of severe allodynia (pain from a non-painful stimulus) and hyperalgesia (exaggerated pain response) makes the intense sensory input of temperature changes, even if mild, likely to be poorly tolerated and could flare the patient's symptoms. The most appropriate clinical decision is to defer this modality and start with a treatment that addresses the central sensitization component, such as graded motor imagery, before introducing potentially painful peripheral stimuli. A: This would be extremely painful and detrimental. C: This is a possible modification but still risky as a first-line treatment given the severe sensory disturbances. D: Fluidotherapy can be useful for desensitization but may still be too intense initially; graded motor imagery is a more foundational intervention for the underlying pathology of CRPS.

Question 10

A 65-year-old patient with chronic venous insufficiency and bilateral lower extremity edema is being treated with an intermittent pneumatic compression (IPC) pump. The patient's resting blood pressure is 140/90 mmHg. The therapist must select an appropriate inflation pressure. Which of the following is the MOST important consideration for setting the maximum pressure?

  1. The pressure should not exceed the patient's diastolic blood pressure. (correct answer)
  2. The pressure should be set to the maximum tolerance of the patient for optimal fluid removal.
  3. The pressure must be set higher than the patient's systolic blood pressure to be effective.
  4. The pressure should be set at 40 mmHg for all patients with venous insufficiency.
Explanation: When approaching intermittent pneumatic compression (IPC) questions, you need to understand the delicate balance between therapeutic effectiveness and vascular safety. IPC works by applying external pressure to compress veins and promote venous return, but excessive pressure can compromise arterial circulation. The key principle is that IPC inflation pressure must never exceed diastolic blood pressure. Your diastolic pressure (90 mmHg in this case) represents the minimum pressure in arteries between heartbeats. If IPC pressure exceeds this threshold, it can compress arteries and potentially cut off blood supply to tissues, creating a dangerous ischemic situation. This makes option A correct – the pressure ceiling is determined by diastolic BP for patient safety. Option B is wrong because maximum patient tolerance doesn't ensure vascular safety. A patient might tolerate dangerously high pressures that could compromise circulation. Option C is dangerously incorrect – pressures exceeding systolic BP (140 mmHg here) would completely occlude arterial flow, potentially causing tissue death. Option D oversimplifies treatment by suggesting a one-size-fits-all approach; 40 mmHg might be too low for some patients or potentially unsafe for others with very low diastolic pressures. Effective IPC typically uses pressures between 30-60 mmHg, but the upper limit is always constrained by the individual's diastolic pressure. For this patient, you'd want therapeutic pressure below 90 mmHg. NPTE strategy: Remember "D for Diastolic = Danger zone" – IPC pressures must stay below diastolic BP to prevent arterial compromise. This safety principle trumps all other considerations.

Question 11

A physical therapist plans to use the 'spray and stretch' technique with a vapocoolant spray to treat active trigger points in a patient's upper trapezius. During the medical history review, the patient mentions having Raynaud's disease, which primarily affects their hands and feet. Which of the following is the MOST appropriate clinical action?

  1. Withhold the use of vapocoolant spray and utilize an alternative technique such as ischemic compression. (correct answer)
  2. Warm the treatment area with a moist heat pack before applying the spray to minimize the cold shock.
  3. Proceed with the technique, as Raynaud's disease in the extremities does not contraindicate application to the neck and shoulder.
  4. Apply the spray from a distance greater than 24 inches to reduce the intensity of the cold stimulus on the skin.
Explanation: When treating trigger points with vapocoolant sprays, you must carefully assess patient contraindications, particularly vascular conditions that affect circulation and temperature regulation. Raynaud's disease is a vascular disorder that causes blood vessels to narrow excessively in response to cold or stress, leading to reduced blood flow and potential tissue damage. The correct answer is A because Raynaud's disease represents an absolute contraindication to vapocoolant spray application, regardless of the treatment location. While Raynaud's commonly affects hands and feet, the underlying vascular hyperreactivity to cold stimuli is systemic. Applying a cold spray anywhere on the body could trigger a vasospastic episode, potentially causing tissue ischemia or exacerbating the patient's condition. The safest approach is selecting an alternative trigger point treatment like ischemic compression, dry needling, or heat therapy. Answer B is incorrect because pre-warming doesn't eliminate the risk—the vapocoolant will still create a significant cold stimulus that could trigger vasoconstriction. Answer C reflects a dangerous misconception that Raynaud's disease only affects reported areas; the vascular hypersensitivity is a systemic condition that contraindicates cold therapy anywhere on the body. Answer D is flawed because increasing spray distance only slightly reduces intensity but doesn't eliminate the cold stimulus or the contraindication. For NPTE success, always remember that vascular conditions affecting temperature regulation (Raynaud's, peripheral vascular disease, cold urticaria) are absolute contraindications to cold modalities, regardless of treatment location. When contraindications exist, immediately pivot to safer alternative treatments rather than attempting to modify the technique.

Question 12

A 68-year-old male with moderate knee osteoarthritis and significant quadriceps weakness is referred for physical therapy. The therapist plans to use neuromuscular electrical stimulation (NMES) for muscle strengthening. The patient's medical history is significant for medically managed hypertension, with a resting blood pressure of 165/95 mmHg today. He also had a deep vein thrombosis (DVT) in the contralateral calf 2 years ago. Which of the following actions is MOST appropriate?

  1. Withhold NMES due to the history of DVT, as it is an absolute contraindication.
  2. Use sensory-level stimulation with a high frequency to avoid a pressor response and muscle fatigue.
  3. Proceed with a strengthening protocol (e.g., 50 pps, 10 sec on/50 sec off) while monitoring blood pressure before, during, and after the intervention. (correct answer)
  4. Use a strengthening protocol with a 1:1 on/off ratio to maximize training volume and expedite strength gains.
Explanation: This question requires analyzing multiple comorbidities. The goal is strengthening, which requires a robust, tetanic contraction (e.g., 35-50 pps, strong amplitude, 1:5 on/off ratio). The patient's hypertension is elevated and is a precaution for NMES, as intense muscle contraction can cause a pressor response (increase in blood pressure). Therefore, monitoring BP is essential. The history of DVT is in the contralateral leg and is 2 years old; it is a precaution, not an absolute contraindication for applying NMES to the quadriceps. The MOST appropriate action is to proceed with the correct intervention while managing the risks. A: A history of DVT is a precaution, not an absolute contraindication, especially when it is old and in the other limb. B: Sensory-level stimulation will not produce a muscle contraction sufficient for strengthening. D: A 1:1 on/off ratio is used for muscle pumping or endurance, not strengthening, and would lead to rapid neuromuscular fatigue.

Question 13

A patient is 4 weeks post-stroke with right hemiparesis and demonstrates an inability to volitionally activate the tibialis anterior, resulting in foot drop during gait. The patient has fair cognitive function but poor motor awareness. Sensory testing reveals diminished light touch sensation on the dorsum of the right foot, but proprioception is intact at the ankle. Which biofeedback intervention is MOST appropriate to facilitate dorsiflexion?

  1. Pressure biofeedback under the heel to discourage heel strike and promote push-off.
  2. Surface electromyographic (EMG) biofeedback with high sensitivity over the tibialis anterior. (correct answer)
  3. Electro-goniometric biofeedback for ankle joint position to provide feedback on range of motion.
  4. Thermal biofeedback on the anterior lower leg to increase blood flow and muscle readiness.
Explanation: The patient's primary deficit is an inability to activate a specific muscle (tibialis anterior) due to poor motor awareness post-stroke. Surface EMG biofeedback directly measures and provides feedback on the electrical activity of a muscle. Using a high sensitivity setting will allow the device to detect even small, weak muscle contractions, providing crucial auditory or visual feedback to help the patient learn to reactivate the muscle. This directly addresses the core problem. The diminished cutaneous sensation makes EMG, which measures motor output, a more reliable feedback source than a modality requiring intact skin sensation. A: Pressure biofeedback under the heel would provide feedback about the wrong phase of gait and would not facilitate dorsiflexion. C: Goniometric biofeedback provides information about the outcome (joint position) but not the muscle activation itself, which is the root of the problem. D: Thermal biofeedback is used for autonomic regulation (e.g., relaxation, managing Raynaud's) and is not appropriate for motor re-education.

Question 14

A 22-year-old collegiate soccer player sustained a Grade II lateral ankle sprain 2 hours prior. The ankle is markedly edematous and ecchymotic. The therapist plans to apply cryotherapy. The patient's medical history reveals they have sickle cell trait. Which of the following is the MOST appropriate application of cryotherapy for this patient?

  1. Submerge the ankle in a 10°C (50°F) ice bath for 15 minutes to achieve circumferential cooling.
  2. Withhold all forms of cryotherapy, as sickle cell trait is an absolute contraindication.
  3. Apply an ice pack over a damp towel for 20 minutes, checking skin every 5 minutes.
  4. Apply a cold compression unit set to 15°C (59°F) for a 10-minute duration with close monitoring. (correct answer)
Explanation: This question tests the management of a precaution versus a contraindication. Sickle cell disease is an absolute contraindication to cryotherapy. Sickle cell trait is a precaution, as intense cold can still potentially cause adverse vascular reactions or sickling. The MOST appropriate choice balances the benefits of cryotherapy for an acute injury with the need for safety. A cold compression unit with a controlled, moderate temperature for a shorter duration (10 minutes) is the safest and most controlled option. A: An ice bath provides intense, prolonged, circumferential cold, which poses the highest risk for this patient. B: This is overly cautious; sickle cell trait is a precaution, not an absolute contraindication, and the benefits of cryotherapy are significant. C: An ice pack for 20 minutes is a standard duration, but may be too long for a patient with this precaution, increasing the risk of adverse events.

Question 15

A 70-year-old patient with a non-healing Stage III pressure injury on their sacrum is being treated with high-voltage pulsed current (HVPC) to promote granulation. The wound bed is clean and 100% granular. The patient's medical chart notes a history of osteomyelitis in the underlying sacral bone that was considered resolved after a 6-week course of intravenous antibiotics ending 3 months ago. Which of the following is the BEST course of action?

  1. Proceed with HVPC, using negative polarity over the wound to stimulate granulation.
  2. Proceed with HVPC, using positive polarity over the wound to promote epithelialization.
  3. Withhold HVPC due to the risk of exacerbating a latent deep infection. (correct answer)
  4. Apply HVPC with a lower intensity and shorter duration to minimize risks associated with the prior infection.
Explanation: The key information is the recent history of osteomyelitis, a deep bone infection, directly underlying the treatment area. While it is considered 'resolved,' applying electrical current in this area carries a significant risk of reactivating a latent infection. Active osteomyelitis is an absolute contraindication, and a recent history is a strong relative contraindication. The potential risk to the patient outweighs the potential benefit for wound healing. The safest and most prudent action is to withhold this modality. A: This choice identifies the correct parameters for granulation but ignores the critical contraindication. B: Positive polarity is used for infected wounds or later during epithelialization, but the primary safety concern is not addressed. D: Reducing the parameters does not eliminate the fundamental risk of applying electrical current over an area of recent deep infection.

Question 16

A patient is receiving quadripolar interferential current (IFC) for diffuse low back pain. The therapist uses a carrier frequency of 4000 Hz and a beat frequency sweeping between 80-150 pps. The patient reports a strong sensation but notes that the focus of the current seems to be missing the most painful area. Which adjustment to the IFC parameters is MOST likely to resolve this issue?

  1. Decrease the beat frequency to a 2-10 pps range.
  2. Switch to a premodulated, bipolar electrode configuration.
  3. Increase the treatment time to allow for greater accommodation.
  4. Activate the vector scan or dynamic vector feature. (correct answer)
Explanation: Standard quadripolar IFC creates a 'cloverleaf'-shaped interference field at the intersection of the two channels. The perceived area of stimulation is fixed. If this area does not align with the patient's pain, a vector scan (or dynamic vector) feature can be used. This feature rhythmically modulates the amplitude of the current in one of the channels, which causes the interference field to rotate or 'scan' through the treatment area. This is ideal for treating poorly localized pain or when the fixed field is not in the correct location. A: Changing the beat frequency would change the physiological mechanism (from gate control to opiate release) but would not change the location of the stimulation field. B: Switching to a bipolar setup would make the treatment more localized under the electrodes, which is the opposite of what is needed. C: Increasing the time would not change the location of the current.

Question 17

A 35-year-old patient presents with acute cervical radiculopathy affecting the C6 nerve root. Clinical findings include a positive Spurling's test, a positive distraction test, and diminished biceps reflex. During the subjective history, the patient reports that she is 10 weeks pregnant. The physical therapist is considering mechanical cervical traction. Which of the following is the MOST appropriate action?

  1. Withhold all forms of mechanical traction until after delivery due to the pregnancy.
  2. Proceed with intermittent mechanical cervical traction in a supine position, starting with 10-12 lbs of force. (correct answer)
  3. Apply manual traction only, as mechanical traction is contraindicated during the first trimester of pregnancy.
  4. Defer traction and recommend a soft cervical collar until the second trimester.
Explanation: This question requires differentiating contraindications for different body regions. Pregnancy is an absolute contraindication for lumbar traction because the harness places pressure on the abdomen and uterus. However, pregnancy is not a contraindication for cervical traction, as there is no risk to the fetus or uterus. Given the clear indication for traction (positive distraction test, radiculopathy), it is appropriate to proceed with the intervention. A: This is incorrect as it misapplies the contraindication for lumbar traction to cervical traction. C: There is no evidence that mechanical traction is more dangerous than manual traction in this context; mechanical traction can provide a more controlled and sustained force. D: Deferring an indicated and safe treatment is not necessary and would prolong the patient's symptoms.

Question 18

A patient presents with acute subacromial bursitis, diagnosed 48 hours ago. The shoulder is painful and inflamed. The therapist wishes to use ultrasound to promote tissue healing without exacerbating the inflammation. The patient's medical history includes an open reduction internal fixation of the proximal humerus with a metal plate and screws 10 years prior. Which ultrasound parameters are MOST appropriate?

  1. 1 MHz, continuous duty cycle, at 1.5 W/cm².
  2. 3 MHz, continuous duty cycle, at 1.0 W/cm².
  3. 3 MHz, pulsed 20% duty cycle, at 0.5 W/cm². (correct answer)
  4. 1 MHz, pulsed 20% duty cycle, at 1.0 W/cm².
Explanation: This scenario requires the integration of three factors: stage of healing, tissue depth, and a precaution. 1) The condition is acute inflammation, which contraindicates thermal ultrasound. A non-thermal effect is desired, requiring a pulsed duty cycle (e.g., 20%). 2) The target tissue, the subacromial bursa, is superficial. A frequency of 3 MHz is appropriate for superficial tissues (1-2 cm). 3) The presence of metal hardware is a precaution for thermal ultrasound due to the risk of creating standing waves and hot spots. Non-thermal (pulsed) ultrasound is considered safe over metal implants. The combination of 3 MHz, 20% duty cycle, and low intensity (0.5 W/cm²) is the most appropriate choice. A: Wrong frequency (deep), wrong mode (thermal), and contraindicated. B: Wrong mode (thermal) and contraindicated. D: Wrong frequency (deep) for a superficial target tissue.

Question 19

A 55-year-old male with chronic low back pain and L5 radiculopathy is being considered for intermittent mechanical lumbar traction. His medical history is significant for rheumatoid arthritis affecting his hands and feet, and an abdominal aortic aneurysm (AAA) that was surgically repaired 5 years ago. Which course of action is MOST prudent?

  1. Proceed with traction at 50% of body weight, as the AAA repair is well in the past.
  2. Use static traction at 25% of body weight to minimize pressure from the harness.
  3. Withhold mechanical traction and consult the referring physician due to the history of AAA repair. (correct answer)
  4. Use positional traction in sidelying instead of mechanical traction to avoid the use of a harness.
Explanation: The most critical information in the stem is the history of a repaired abdominal aortic aneurysm (AAA). While not an active aneurysm, the placement of a lumbar traction harness and the forces generated can place stress on the surgical site and aorta. This is a significant relative contraindication that requires medical clearance. The safest and most prudent action is to withhold the intervention and consult with the physician. A: Proceeding without consultation ignores a significant safety risk, regardless of the parameters. B: Changing from intermittent to static traction does not eliminate the risk posed by the harness and pressure on the abdomen. D: Positional traction, while gentler, may not be sufficient for radiculopathy and does not completely eliminate stress to the trunk; the primary issue of a significant relative contraindication remains unaddressed.

Question 20

A patient who is 3 months post-CVA presents with significant spasticity of the wrist flexors (Modified Ashworth Scale score of 3), which interferes with hygiene and splinting. The physical therapist's goal is to achieve a temporary reduction in flexor tone to allow for passive stretching. Which NMES application is MOST appropriate for this goal?

  1. Application to the wrist flexors with a high frequency and short on/off time (1:1) to induce muscle fatigue.
  2. Application to the antagonist wrist extensors with a gradual ramp-up time to facilitate reciprocal inhibition. (correct answer)
  3. Application to the wrist flexors with a low frequency and long pulse duration to re-educate the muscle.
  4. Application of sensory-level stimulation over the median nerve to block spasticity via the gate-control theory.
Explanation: A primary method for reducing spasticity with NMES is to stimulate the antagonist muscles. Activating the wrist extensors will, via reciprocal inhibition at the spinal cord level, cause a reflex relaxation of the spastic agonist wrist flexors. Using a slow ramp-up time (e.g., 2-4 seconds) is crucial to prevent a rapid stretch of the spastic flexors, which could trigger a stretch reflex and increase their activity, defeating the purpose of the treatment. A: While stimulation of the spastic agonist to induce fatigue is another theoretical approach, stimulating the antagonist is a more common and often more effective technique. C: This protocol is for muscle re-education and strengthening, which is not the goal and could potentially increase spasticity. D: The gate-control theory relates to pain modulation, not the motor control mechanisms underlying spasticity.