Summary
Objective: To evaluate the biomechanical properties of single 3.5 mm broad dynamic compression
plate (DCP) and double 3.5 mm String-of-Pearls (SOP) plate constructs in single-cycle
bending and torsion. We hypothesized that the double SOP construct would outperform
the broad DCP in both bending and torsional testing.
Methods: Broad DCP plates and double 3.5 mm SOP plates were secured to a previously validated
bone model in an effort to simulate bridging osteosynthesis. Constructs were tested
in both four-point bending and torsional testing.
Results: The double SOP constructs had significantly greater bending stiffness, bending strength,
bending structural stiffness, and torsional stiffness when compared to the broad DCP
constructs. The single broad DCP constructs had significantly higher yield torque
and yield angles during torsional testing.
Clinical relevance: Although the in vitro mechanical performance of the double SOP construct was significantly greater than
the single broad DCP constructs under bending loads, the actual differences were small.
Various patient, fracture, and implant factors must be considered when choosing an
appropriate implant for fracture fixation.
Keywords
String-of-Pearls - broad dynamic compression plate - implant failure - bending - torsion
