PRC PRC Muscle Imbalance & Pattern Recognition 2 — Questions and Answers
Question 1: Which test is used in PRI to assess Left AIC pattern resolution?
- Seated rotation test
- 90/90 hip lift test (Correct answer)
- FABER test
- Trendelenburg test
Correct answer: 90/90 hip lift test
The 90/90 hip lift test evaluates the patient's ability to achieve a neutral pelvic position with left hamstring activation, serving as a key marker of Left AIC pattern resolution.
Question 2: Inhibition of which muscle is a primary goal when addressing the Right BC pattern in PRI treatment?
- Right serratus anterior
- Right pectoralis minor (Correct answer)
- Left subscapularis
- Right rhomboid major
Correct answer: Right pectoralis minor
Inhibiting the right pectoralis minor reduces the forward shoulder pull that drives the Right BC pattern, allowing restoration of right thoracic rotation.
Question 3: In PRI pattern recognition, bilateral patterns such as PEC are generally considered:
- Easier to treat because both sides are affected symmetrically
- More complex and harder to resolve than unilateral patterns (Correct answer)
- Only present in pediatric and adolescent populations
- Always secondary to an underlying unilateral AIC pattern
Correct answer: More complex and harder to resolve than unilateral patterns
Bilateral PRI patterns like PEC are generally more complex, involving both sides of the body and requiring more comprehensive treatment to restore normal alternating function.
Question 4: The Right AF ER (Acetabular Femoral External Rotation) finding in PRI indicates:
- The right hip is actively positioned in internal rotation
- The right hip is unable to achieve any external rotation
- The right femur is positioned in relative external rotation within the acetabulum (Correct answer)
- The right ilium is posteriorly rotated and elevated
Correct answer: The right femur is positioned in relative external rotation within the acetabulum
Right AF ER describes the right femur being positioned in relative external rotation within the acetabulum, a common finding in the typical Left AIC asymmetrical pattern.
Question 5: Which finding on a forward bending test would suggest a Right-on-Right sacral torsion in PRI assessment?
- Left lumbar convexity with left sacral base elevation
- Right lumbar convexity with right sacral base elevation
- Left lumbar convexity with right sacral base elevation (Correct answer)
- Bilateral lumbar flattening with no sacral asymmetry
Correct answer: Left lumbar convexity with right sacral base elevation
A Right-on-Right sacral torsion presents with a left lumbar convexity and right sacral base elevation on forward bending, reflecting the sacrum rotating on the right oblique axis.
Question 6: Over-activation of the right hamstring in PRI patterns is most commonly associated with:
- Isolated right innominate anterior rotation
- Isolated left innominate posterior rotation
- Left innominate anterior rotation with compensatory right innominate posterior rotation via right hamstring (Correct answer)
- Bilateral sacral counternutation
Correct answer: Left innominate anterior rotation with compensatory right innominate posterior rotation via right hamstring
In the Left AIC pattern, the right hamstring compensates by posteriorly rotating the right innominate as the left innominate anteriorly rotates, creating the characteristic asymmetrical pelvic position.
PRC PRC Muscle Imbalance & Pattern Recognition 2
Which test is used in PRI to assess Left AIC pattern resolution?