Which cast is used for fracture of the shaft of the humerus with callus formation?

• A. Hanging Cast
• B. Short Arm Posterior Mold
• C. Functional Cast
• D. Abduction Splint/Airplane Cast

Answer: (C)

When a fracture of the humeral shaft shows callus formation, enough stability has developed to allow controlled movement rather than complete immobilization. A functional cast is designed to hold the arm in a supportive position while permitting movement at the elbow and shoulder, balancing stability with mobility. This functional approach helps prevent stiffness, preserves muscle function, and accommodates ongoing healing as the callus forms. Other casts mentioned are more restrictive or suited to different injury patterns—rigid immobilization like a hanging cast or a short arm posterior mold can overly limit joint movement, and an abduction/airplane cast is typically for shoulder or AC injuries, not mid-shaft humerus fractures in the healing stage.