Which statement best describes the interaction between intrinsic and extrinsic instability factors?

Which statement best describes the interaction between intrinsic and extrinsic instability factors?

• A. Increased falls
• B. Decreased falls
• C. No change
• D. Improved balance

Answer: (A)

When intrinsic instability factors (internal balance problems, weakness, sensory loss) interact with extrinsic instability factors (environmental hazards like poor lighting, clutter, uneven surfaces), the fall risk tends to rise more than either factor alone. The compromised postural control from intrinsic deficits makes it harder to compensate for external perturbations, so even small hazards can trigger a loss of balance and a fall. That’s why the outcome is increased falls. The other options imply less risk or no change, which isn’t consistent with how these risks accumulate.

When intrinsic instability factors (internal balance problems, weakness, sensory loss) interact with extrinsic instability factors (environmental hazards like poor lighting, clutter, uneven surfaces), the fall risk tends to rise more than either factor alone. The compromised postural control from intrinsic deficits makes it harder to compensate for external perturbations, so even small hazards can trigger a loss of balance and a fall. That’s why the outcome is increased falls. The other options imply less risk or no change, which isn’t consistent with how these risks accumulate.