PTA Critical Thinking 3 — Questions and Answers
Question 1: A PTA wants the best evidence for treating shoulder impingement. Which source provides the HIGHEST level of evidence?
- A single case study
- Expert opinion from a senior PT
- A systematic review of randomized controlled trials (Correct answer)
- A textbook published 10 years ago
Correct answer: A systematic review of randomized controlled trials
Systematic reviews synthesize multiple RCTs and sit at the top of the evidence hierarchy for clinical decision-making.
Question 2: What does the 'sensitivity' of a clinical test BEST describe?
- The ability to correctly identify patients who do NOT have the condition
- The ability to correctly identify patients who DO have the condition (Correct answer)
- The overall diagnostic accuracy of the test
- The reproducibility of the test across different raters
Correct answer: The ability to correctly identify patients who DO have the condition
Sensitivity measures the proportion of true positives correctly identified; a highly sensitive test rarely misses the condition.
Question 3: A clinical guideline recommends cervical manual therapy, but the PTA's patient has significant osteoporosis. The BEST approach is to:
- Follow the guideline exactly as written for all patients
- Avoid the technique and discuss the contraindication with the supervising PT (Correct answer)
- Apply manual therapy at reduced force without informing the PT
- Substitute electrical stimulation without consulting the PT
Correct answer: Avoid the technique and discuss the contraindication with the supervising PT
Clinical guidelines apply to the general population; patient-specific contraindications must be identified and communicated to the supervising PT before proceeding.
Question 4: Which statement BEST defines evidence-based practice (EBP) in physical therapy?
- Always following research evidence regardless of patient preferences
- Integrating best research evidence, clinical expertise, and patient values (Correct answer)
- Using only the most recently published studies for all treatment decisions
- Applying the same intervention to all patients with the same diagnosis
Correct answer: Integrating best research evidence, clinical expertise, and patient values
EBP is a three-legged stool: research evidence, clinician expertise, and patient preferences must all be considered.
Question 5: A PTA reads a study concluding that ultrasound is ineffective for calcific tendinitis. The BEST response is to:
- Immediately discontinue ultrasound for all patients
- Discuss the finding with the supervising PT to inform clinical decision-making (Correct answer)
- Ignore the study because it conflicts with personal clinical experience
- Use the study to override the PT's current plan of care
Correct answer: Discuss the finding with the supervising PT to inform clinical decision-making
New evidence should be brought to the supervising PT's attention; the PTA does not unilaterally change the plan of care based on a single study.
Question 6: A 'minimal clinically important difference' (MCID) on an outcome measure is BEST described as:
- Any change that reaches statistical significance (p < 0.05)
- The smallest change that is meaningful to the patient's daily function (Correct answer)
- A change of at least 50% from the baseline score
- Any change documented by the treating clinician
Correct answer: The smallest change that is meaningful to the patient's daily function
The MCID represents the threshold of change that patients perceive as beneficial, distinguishing meaningful improvement from measurement noise.
Question 7: Which feature is MOST characteristic of a well-designed randomized controlled trial (RCT)?
- Participants and assessors are blinded, with random assignment to treatment and control groups (Correct answer)
- All participants receive the same treatment to allow fair comparison
- The researcher selects participants based on expected favorable outcomes
- Outcome measures are selected after data collection to best reflect results
Correct answer: Participants and assessors are blinded, with random assignment to treatment and control groups
Blinding and random allocation minimize bias, making RCTs the gold standard for evaluating treatment effectiveness.
PTA Critical Thinking 3
A PTA wants the best evidence for treating shoulder impingement.
Which source provides the HIGHEST level of evidence?