Which flexibility test is used to assess quadriceps length?

• A. Ely Test
• B. Thomas Test
• C. Straight Leg Raise
• D. Ober's Test

Answer: (B)

Testing quadriceps length focuses on the rectus femoris, the part of the quadriceps that crosses both the hip and knee. Ely's test in the prone position directly assesses this muscle’s length. As the knee is passively flexed, a tight rectus femoris pulls the hip into flexion, causing the thigh to lift off the table or the pelvis to tilt. That hip flexor response indicates shortened rectus femoris and reduced quadriceps length. A normal result shows no unintended hip movement when the knee is flexed, meaning adequate rectus femoris length.

Other tests target different muscle groups: the Thomas test gauges hip flexor (iliopsoas) length, not quadriceps; the straight-leg raise assesses hamstring length; and Ober's test evaluates iliotibial band tightness. So Ely's test is the one that best isolates and reveals quadriceps (rectus femoris) length.