Supracondylar fracture of the humerus: MUA and K-wiring of Flexion pattern fracture
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Supracondylar fracture of the distal humerus is the commonest elbow injury in children. Extension fractures with posterior displacement of the distal fragment are the most frequent. Flexion injuries with anterior displacement of the distal fragment account for approximately 2-3% of all supracondylar fractures. They are generally the result of falls onto the olecranon process (extension injuries occur secondary to fall onto outstretched hand). It is important not to miss these injuries since management is often different to the more common extension variety. Flexion type injuries typically occur in slightly older children (5-8 years compared to 2-4 years).
Injuries to the brachial artery and median and radial nerves are much more common in extension in extension supracondylar fractures (neurovascular structures are anterior and therefore stretched as the fracture extends) than the flexion type. The commonest nerve injury in flexion type injuries is the ulnar nerve, occurring in 10-20% of cases.
Closed reduction and percutaneous K wire stabilisation should be attempted as the ideal treatment. However, achieving and maintaining adequate reduction of the fracture by closed means is difficult and open reduction is required much more frequently than for extension type injuries.
Outcomes are good providing adequate reduction can be achieved. Non union and long term stiffness are very rare.
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Author:Christopher Edward Bache FRCS (Tr & Orth)
Institution: The Royal Orthopaedic Hospital and Birmingham Childrens Hospital, Birmingham, UK.