Certified Instrument Specialist (CIS) Practice Exam 2025 – The All-in-One Guide to Achieving Certification Success!

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What type of screw is typically inserted over a guide wire?

Suction screw

Cannulated screw

A cannulated screw is specifically designed to be inserted over a guide wire, which helps in precisely positioning the screw during surgical procedures. The hollow core of the cannulated screw allows the guide wire to pass through, enabling the surgeon to accurately place the screw in the desired location while maintaining alignment and stability. This feature is particularly useful in orthopedic surgeries where precise placement is critical for effective fixation of bone fractures or in the stabilization of joints.

In contrast, other types of screws, like suction screws or compression screws, do not have this hollow core design and therefore cannot be used over a guide wire. Threaded screws, while they do provide a grip for securing materials together, also lack the specific design that facilitates the use of a guide wire, making them unsuitable for applications requiring such precision.

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Compression screw

Threaded screw

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