Healing the Humeral Shaft Nonunion: Prior Surgery Confers Increased Risk of Recalcitrant Nonunion

Area of Science:

• Orthopedic surgery
• Trauma surgery
• Bone healing research

Background:

• Humeral shaft nonunion presents a significant challenge in orthopedic trauma.
• Previous surgical interventions may influence the success rates of subsequent nonunion repairs.
• Understanding factors affecting recalcitrant nonunion is crucial for optimizing patient outcomes.

Purpose of the Study:

• To compare the success rates of humeral shaft nonunion repair between patients with and without prior surgery.
• To identify factors associated with recalcitrant nonunion in patients undergoing humeral shaft nonunion repair.

Main Methods:

• Retrospective study conducted at two academic trauma centers.
• Inclusion criteria: skeletally mature patients with aseptic humeral shaft nonunion (AO/OTA 11A-C, 12A-C).
• Primary outcome: osseous union; analysis of patient, injury, and treatment factors.

Main Results:

• 159 patients were analyzed; 82 had prior operative treatment.
• Patients with prior surgery had a significantly higher rate of recalcitrant nonunion (21% vs 3%, p<0.001).
• The number of prior operations strongly correlated with increased risk of recalcitrant nonunion (p=0.004).

Conclusions:

• Prior operative treatment significantly increases the risk of recalcitrant humeral shaft nonunion.
• The presence of any prior surgery, rather than the initial fracture treatment, is a key factor for persistent nonunion.
• Surgical history is a critical consideration in managing humeral shaft nonunion.