Interfragmentary compression across a simulated scaphoid fracture—analysis of 3 screws

A central threadless shaft screw is better than a fully threaded variable pitch screw for unstable scaphoid nonunion: A biomechanical study

“…The compression force generated by a compression screw is thought to be an important factor in facilitating union by reducing the fracture gap and improving fracture surface interdigitation, thereby promoting primary bone healing and increasing rotational and bending stability [2,4,11,14,18,22]. We measured the compression forces between the two different interfragmentary gaps generated by the HCS 3.0, Herbert-Whipple, and Acutrak 1 miniscrews by using two load cells and three polyurethane foam blocks.…”

“…By contrast, our method easily represented the osteotomy plane and minimised the bias from creating the scaphoid nonunion model. Secondly, we used a polyurethane foam scaphoid nonunion model to compare compression forces in two interfragmentary gaps, which may have limited application to clinical situations because it is unable to reproduce the anatomical structure of the scaphoid bone [4]. However, our polyurethane model was appropriate for the objective of the study, which was to compare interfragmentary compression forces generated by different headless screw designs.…”

First Experiences With a New Adjustable Plate for Osteosynthesis of Scaphoid Nonunions

“…The Herbert screw is suitable for the treatment of recent fractures and in combination with bone chip plasty for the treatment of fracture pseudarthroses. 10 -14 This construction was adopted by many manufacturers and [21][22][23][24][25] What are currently the indications for plate osteosynthesis? In rare cases, healing is either delayed or does not occur at all.…”

Scaphoid Nonunion: Herbert Screw Fixation through Dorsal Approach

“…A open dorsal approach is most useful for proximal Screw fixation provides more successful union rates than K-wire fixation but which of the screw types provides better compression remains debatable [29][30][31] . Most previous studies suggest that the Acutrak screw generates greater compression.…”