Factors affecting forearm compartment pressures in children with supracondylar fractures of the humerus

Area of Science:

• Pediatric Orthopedics
• Trauma Surgery
• Musculoskeletal Research

Background:

• Supracondylar humerus fractures are common in children.
• Compartment syndrome is a serious complication, but its early diagnosis can be challenging.
• Understanding forearm compartment pressure dynamics is crucial for managing these injuries.

Purpose of the Study:

• To evaluate forearm compartment pressures in children with supracondylar humerus fractures.
• To identify compartments and locations with the highest pressures.
• To assess the impact of fracture reduction and elbow flexion on these pressures.

Main Methods:

• Forearm compartment pressures were measured in 29 children with supracondylar humerus fractures.
• Measurements were taken in dorsal, superficial volar, and deep volar compartments.
• Pressures were recorded pre- and post-reduction, and with varying degrees of elbow flexion.

Main Results:

• The deep volar compartment exhibited significantly elevated pressures compared to other compartments.
• Pressures were significantly higher in the proximal forearm, closer to the elbow.
• Fracture reduction did not consistently alter pressures; however, elbow flexion beyond 90 degrees significantly increased them.

Conclusions:

• Forearm compartment pressures following supracondylar humerus fractures are greatest in the deep volar compartment and proximally.
• Elevated pressures (>30 mm Hg) can occur without overt clinical signs of compartment syndrome.
• Immobilizing the elbow in >90 degrees of flexion should be avoided to prevent exacerbating compartment pressures.