Disability from moderate instability of the ankle joint is most closely associated with which condition?

• A. Ankle sprain
• B. Calf atrophy
• C. Achilles tendinopathy
• D. Ankle dislocation

Answer: (B)

Moderate ankle instability leads to protective disuse of the leg, and over time this disuse causes the calf muscles to atrophy. When the calf muscles shrink, push-off and ankle stability during walking weaken, worsening functional ability and creating ongoing disability. Calf atrophy thus mirrors the downstream consequence of a destabilized ankle—the muscle loss that makes activity harder even when the joint itself isn’t acutely injured.

An ankle sprain is the initial cause of instability, but the question focuses on the disability that results from sustained instability, not the triggering injury. Achilles tendinopathy involves tendon pain and dysfunction rather than joint instability, and an ankle dislocation represents a more severe, acute instability with a different clinical course.