Which test is most specific for detecting iliopsoas impingement in the hip?

Which test is most specific for detecting iliopsoas impingement in the hip?

• A. FABER test
• B. Thomas test
• C. Ober test
• D. FADIR test

Answer: (D)

The key idea is that iliopsoas impingement happens when the iliopsoas tendon is pressed against the anterior acetabular rim during hip motion. The FADIR maneuver – flexion, adduction, and internal rotation – places the hip into a position where the iliopsoas tendon and the anterior rim come into close contact. If this provocative position reproduces anterior hip pain in a patient with compatible clinical clues, it strongly points to iliopsoas impingement because it directly stresses that specific tendon-rim contact. The other tests target different structures or conditions. The FABER test stresses the joint and surrounding soft tissues in a way that can elicit pain from various hip pathologies, not specifically iliopsoas impingement. The Thomas test assesses hip flexor length and tightness rather than a tendon impingement mechanism. The Ober test checks IT band and tensor fasciae latae tightness, which is a different issue altogether. Thus, FADIR is the most likely to reproduce symptoms arising from iliopsoas impingement and is considered the most specific among these options for that condition.

The key idea is that iliopsoas impingement happens when the iliopsoas tendon is pressed against the anterior acetabular rim during hip motion. The FADIR maneuver – flexion, adduction, and internal rotation – places the hip into a position where the iliopsoas tendon and the anterior rim come into close contact. If this provocative position reproduces anterior hip pain in a patient with compatible clinical clues, it strongly points to iliopsoas impingement because it directly stresses that specific tendon-rim contact.

The other tests target different structures or conditions. The FABER test stresses the joint and surrounding soft tissues in a way that can elicit pain from various hip pathologies, not specifically iliopsoas impingement. The Thomas test assesses hip flexor length and tightness rather than a tendon impingement mechanism. The Ober test checks IT band and tensor fasciae latae tightness, which is a different issue altogether. Thus, FADIR is the most likely to reproduce symptoms arising from iliopsoas impingement and is considered the most specific among these options for that condition.