In a supracondylar fracture of the distal humerus, which complication should be monitored?

• A. Fracture nonunion
• B. Compartment syndrome
• C. Joint dislocation
• D. Nerve injury

Answer: (B)

In a supracondylar fracture of the distal humerus, monitoring for compartment syndrome is particularly important due to the anatomical location of the injury and the potential for significant swelling. This type of fracture often occurs in children and can lead to increased pressure within the compartments of the forearm. Compartment syndrome can compromise blood supply and lead to irreversible muscle and nerve damage if not recognized and treated promptly.

The classic signs of compartment syndrome include severe pain, pain on passive stretching, muscle weakness, and sensory deficits within the affected compartment. Prompt diagnosis and treatment, which may involve fasciotomy, are critical to prevent long-term complications.

In this context, while other complications like nonunion, joint dislocation, and nerve injury can certainly occur, the acute nature of compartment syndrome necessitates urgent attention and monitoring immediately following the fracture. This makes it the priority to watch for in patients with a supracondylar fracture.