Sternal instability that is classified as grade 1-2 or grade 3 sternum requires what kind of activity?

• A. No modification; continue as usual.
• B. Complete avoidance of upper body movement.
• C. Modified activity to avoid dehiscence.
• D. Only lower body exercise.

Answer: (C)

Protecting a healing sternum is the main idea. When there is sternal instability, the sternum can reopen or fracture if stressed by too much activity. With mild to moderate instability (grades 1–2) or more significant instability (grade 3), the safest approach is to limit and modify activities so they don’t place forces across the chest. This means avoiding pushing, pulling, heavy lifting, and movements that separate the chest halves, while still allowing gradual, controlled movement and gentle strengthening. The goal is to prevent dehiscence while promoting safe recovery, rather than continuing as usual or restricting only to the legs.