Effect of a Dynamic Fixation Construct on Syndesmosis Reduction: A Cadaveric Study

Prior research has shown that syndesmotic injuries are often managed with static fixation methods like screws. However, the effectiveness of these methods in restoring anatomical alignment remains uncertain. No prior work had resolved how dynamic fixation might influence syndesmotic reduction. This gap motivated researchers to investigate alternative fixation strategies. Established knowledge includes the role of syndesmotic ligaments in ankle stability. Yet, the impact of fixation constructs on ligamentous malreduction is less understood. This study addresses the challenge of achieving proper syndesmotic alignment. It builds on prior work but introduces a novel method of fixation.

The aim of this study was to evaluate the effect of a dynamic fixation construct on syndesmotic reduction in cadaveric specimens. The specific problem addressed is the challenge of restoring anatomical alignment after syndesmotic malreduction. The motivation stems from the limitations of static fixation techniques. Researchers sought to determine if dynamic fixation could improve alignment outcomes. The study focused on the anterior edge of the fibula and tibial incisura measurements. It aimed to compare static and dynamic fixation methods directly. The goal was to assess whether dynamic fixation could achieve better reduction. This approach could offer a new surgical strategy for syndesmotic injuries.

The study used 10 cadaveric specimens for testing. Syndesmotic ligaments were sectioned to simulate injury. A clamp was used to induce malreduction of the syndesmosis. The sagittal syndesmotic displacement (SSD) was measured using anatomical landmarks. A 3.5-mm quadricortical screw was placed as a static fixation method. After screw placement, the SSD was measured again. A suture-button construct was then introduced as a dynamic fixation method. The SSD was measured once more after this intervention.

The dynamic fixation construct reduced SSD to within 1 mm of native anatomy. In contrast, the static screw construct did not improve SSD measurements. The suture-button construct showed a statistically significant improvement. The P-value was less than 0.0001, indicating strong evidence. The static screw maintained the same SSD as the clamped malreduction. The dynamic construct allowed the fibula to be pulled into the tibial incisura. This effect was attributed to the size difference between suture and drill hole. The results suggest that dynamic fixation is more effective in restoring alignment.

The authors propose that dynamic fixation constructs can help restore anatomical alignment after syndesmotic malreduction. They emphasize that the suture-button construct reliably improved SSD measurements. The study validates the benefit of dynamic fixation as reported in clinical literature. The size difference between suture and drill hole allows for fibular repositioning. The findings do not justify ignoring proper syndesmotic reduction. The authors suggest that dynamic fixation should be considered as an alternative method. They caution against viewing the results as a replacement for proper reduction techniques. The study supports the use of dynamic fixation in specific surgical contexts.