Which are common observable signs of impaired postural stability during a single-leg stance?

• A. Steady posture with minimal sway
• B. Excessive sway, loss of balance, frequent step or stumble, trunk rotation
• C. Heel-to-toe alignment
• D. Rigid stance with no movement

Answer: (B)

During a single-leg stance, balance relies on the body’s ability to keep the center of gravity over a small base of support. When postural stability is impaired, you’ll typically notice instability and compensatory movements rather than a perfectly steady hold. Signs include excessive sway, a loss of balance, needing to take a step or stumble to regain support, and the trunk rotating to help reorient the body. These reflect the neuromuscular system struggling to control movement under a challenging balance task.

In contrast, a steady posture with minimal sway suggests good control; heel-to-toe alignment is simply a way to challenge balance and isn’t itself a sign of impairment; and a rigid stance with no movement doesn’t accurately indicate normal postural control in this context.