• Sebastian Lappen, Sebastian Siebenlist, Tim Leschinger, Pavel Kadantsev, Stephanie Geyer, Kilian Wegmann, Lars-Peter Müller, and Michael Hackl.
• Department of Sports Orthopeadics, Technical University of Munich, Klinikum rechts der Isar, Munich, Germany. Electronic address: sebastian.lappen@tum.de.
• Injury. 2024 Apr 1; 55 (4): 111486111486.

ObjectiveThe trochlea is of great importance for the stability of the elbow and its fixation in low transcondylar fractures of the distal humerus is especially challenging. The aim of this study was to determine the optimal trochlea fixation in double plate osteosynthesis of intraarticular distal humerus fractures.MethodsA low transcondylar, C3-type distal humerus fracture was created in 20 fresh-frozen human cadaveric humeri. The samples were then randomly divided into two groups of 10 specimens each. Double plate osteosynthesis was performed in both groups. In group A, the two most distal screws of the lateral plate were inserted into the trochlea fragment. In group B, these screws did not extend into the trochlea. Displacement under cyclic loading and ultimate failure loads were determined for all specimens.ResultsGroup A showed significantly less displacement under cyclic loading in each measurement interval (0.92 mm vs. 1.53 mm after 100 cycles, p = 0 0.006; 1.10 mm vs. 1.84 mm after 1000 cycles, p = 0.007; 1.18 mm vs. 1.98 mm after 2000 cycles, p = 0.008). The ultimate failure load was significantly higher in group A than in group B (345.61 ± 120.389 N vs. 238.42 ± 131.61 N, p = 0.037).ConclusionsFixation of the trochlea with interdigitating screws in double plate osteosynthesis of low-condylar type C distal humerus fractures results in superior construct stability.Level Of Evidencenot applicable (biomechanical).Copyright © 2024. Published by Elsevier Ltd.

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