Step down test interpretation suggests proximal weakness if there is:

Step down test interpretation suggests proximal weakness if there is:

• A. Excessive knee valgus with stable pelvis indicates strong gluteus medius.
• B. Poor frontal plane control suggests proximal weakness or motor control deficits.
• C. Excellent trunk control indicates poor patellar tracking.
• D. Normal frontal plane control rules out proximal weakness.

Answer: (B)

Proximal stability and frontal-plane neuromuscular control are what the step-down task evaluates. When descending, keeping the knee aligned with the foot and the pelvis level depends on the strength and coordinated firing of hip abductors (like the gluteus medius) and trunk/lumbo-pelvic stabilizers. If frontal-plane control is poor during the movement, it signals proximal weakness or motor control deficits in those stabilizers, because the body is unable to maintain proper alignment and prevent knee collapse or pelvis drift. The other ideas don’t fit as well. Excessive knee valgus with a stable pelvis would more likely reflect weak hip stabilizers rather than implying the gluteus medius is strong. Excellent trunk control doesn’t directly indicate patellar tracking problems, since patellar tracking involves knee mechanics and quad-hip coordination beyond trunk performance. Normal frontal-plane control doesn’t rule out proximal weakness, because weaknesses can be present but compensated for in this task or revealed under different loading.

Proximal stability and frontal-plane neuromuscular control are what the step-down task evaluates. When descending, keeping the knee aligned with the foot and the pelvis level depends on the strength and coordinated firing of hip abductors (like the gluteus medius) and trunk/lumbo-pelvic stabilizers. If frontal-plane control is poor during the movement, it signals proximal weakness or motor control deficits in those stabilizers, because the body is unable to maintain proper alignment and prevent knee collapse or pelvis drift.

The other ideas don’t fit as well. Excessive knee valgus with a stable pelvis would more likely reflect weak hip stabilizers rather than implying the gluteus medius is strong. Excellent trunk control doesn’t directly indicate patellar tracking problems, since patellar tracking involves knee mechanics and quad-hip coordination beyond trunk performance. Normal frontal-plane control doesn’t rule out proximal weakness, because weaknesses can be present but compensated for in this task or revealed under different loading.