Cannulated & Herbert Screws Types

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The Herbert screw is a specialized orthopedic implant to achieve interfragmentary compression. There is no head in this unique device and threads are present at both ends of the bone screw, with a pitch differential between the trailing and leading threads. The intention is for the bone screw to be buried under a bony surface. Interfragmentary compression is attained by the difference in thread pitch: the coarser pitch moves the orthopedic screw a greater distance through bone with every turn than does the finer pitch. As the screw is twisted, the bone surfaces come together creating compression.

A screw head is thus not needed. In absence of a screw head it’s possible to insert this bone screw through articular surfaces without the head being prominent. A cannulated version is accessible: Cannulated Herbert screw enables percutaneous scaphoid fracture fixation, avoids prolonged cast immobilization and enables a more rapid return to work or sport.

A cannulated Herbert screw is easier to install than an uncannulated version and provides better protection to the bone spicules that interdigitate between the screw’s threads in comparison with cases in which the bone is originally tapped, the tap is removed, and the bone screw is then installed during a 3rd pass through the bone threads. Placing a guide wire first enables for correct visualization of the path, position, as well as length of the screw. The guide wire also helps in reduction and control of fractured fragments. Current indications include capitellar, fractures of the carpal scaphoid, fractures, radial head fractures, osteochondritis dissecans, osteochondral fractures, and small joint arthrodesis. The Herbert screw may be quite tough to remove.

https://www.siiora.com/blogs/cannulated-herbert-screws-types/





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