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Headless Compression Cannulated Screw

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ไตรมาสที่ 1: What is a Headless Compression Cannulated Screw used for?

A1: It is designed for fixation of small bone fractures where minimal soft tissue irritation and countersinking are required, such as scaphoid or metatarsal fractures.

ไตรมาสที่ 2: Why is it called “headless” Cannulated Screw?

A2: Because it has no prominent head, allowing it to be fully buried within the bone and minimizing soft tissue irritation.

ไตรมาสที่ 3: How does it create compression?

A3: Through differential pitch threading along the screw length, where the leading and trailing threads have different pitches to draw fragments together.

ไตรมาสที่ 4: What are the typical sizes for Headless Compression Cannulated Screw?

A4:Common diameters include 2.0/2.5/3.0/4.5/6.5 mm, with varying lengths from 10 mm to 120 mm, depending on anatomical application.

คำถามที่ 5: What are the advantages over it?

A5: They provide smooth bone surfaces, eliminate screw head prominence, and reduce the need for later removal.

คำถามที่ 6: What are the most common complications?

A6: Includes screw protrusion if not fully seated, fracture distraction if improperly sized, and difficult removal due to bone overgrowth.

คำถามที่ 7: What are common applications?

A7: Scaphoid fractures, metacarpal fractures, talus fractures, and small joint fusions.