Primary stability of nailing versus low-profile dual plating of mid-clavicular fractures- a biomechanical cadaveric...

Low-profile dual plating techniques have gained popularity for diaphyseal clavicula fractures due to their potential to reduce soft tissue irritation. Intramedullary nailing is also an established surgical option for treatment of diaphyseal clavicle fractures. The present study therefore aimed to evaluate whether a 2 × 2.0 mm dual plating system can achieve biomechanical performance comparable to intramedullary nailing while reducing implant-related complications.

Twelve paired human cadaveric clavicles with simulated unstable diaphyseal shaft fractures AO/OTA 15.2 C were stabilized via elastic nailing (Group 1) or dual plating using a superior and an anterior 2.0 mm plate (Group 2). Specimens underwent biomechanical testing with initial quasistatic superior-inferior and anterior-posterior bending, followed by cyclic superior-inferior loading to failure. Interfragmentary movements were monitored by optical motion tracking.

Dual plating demonstrated significantly higher initial construct stiffness in all bending directions and a reduced neutral zone compared to intramedullary nailing (p ≤ 0.016). In addition, fracture displacement amplitudes over all cycles were significantly higher in Group 1 versus Group 2 (p = 0.002). The number of cycles required to reach the test endpoint at a 45 mm displacement did not differ significantly between the groups (p = 0.160), with Group 1 averaging 24,420 cycles (SD ± 3,615) and Group 2 averaging 28,232 cycles (SD ± 5,417).

Low-profile dual plating may offer improved initial stability of midshaft clavicle fractures without compromising their long-term performance, making it a promising alternative to elastic nailing. In selected patients with simpler unstable midshaft clavicle fractures, 2 × 2.0 mm dual plating may offer effective biomechanical stability.