Which description best matches stress fractures?

• A. A bone crack caused by overloaded bone after muscle fatigue
• B. A joint dislocation
• C. A sprain
• D. A muscle strain

Answer: (A)

Stress fractures happen when a bone experiences repetitive loading that builds up faster than it can repair, especially once muscles are fatigued and grip or shock absorption declines. When the muscles tire, they don't cushion impacts as well, so more force is transmitted to the bone, causing tiny cracks to form over time. The description that best fits this is a bone crack caused by overloaded bone after muscle fatigue.

The other options describe different injuries: a joint dislocation is when bones at a joint come out of alignment; a sprain is an injury to ligaments; a muscle strain is a tear or overstretch of muscle tissue.