Cannulated Cancellous Screw (Partly Threaded)

The Cannulated Cancellous Screw Partly Threaded is an orthopedic bone screw designed for fixation in cancellous bone. Cancellous bone is the softer, spongy bone found in metaphyseal and periarticular regions. This screw features a hollow central shaft and a partial thread configuration. Together, these two design elements support accurate placement and interfragmentary compression at the fracture site.

Design Features

The hollow shaft is a core part of the cannulated design. It allows the screw to slide over a guide wire during surgery. First, the surgeon places the guide wire under fluoroscopic guidance. Then, the screw follows along that same path. As a result, placement becomes more controlled and minimally invasive. In addition, soft tissue disruption stays minimal compared to many open techniques.

The partly threaded shaft enables lag screw function. Specifically, the threads engage only the far bone fragment. The smooth, unthreaded section slides freely through the near fragment. Because of this, tightening the screw draws the fragments together and generates compression across the fracture site.

Thread Design for Cancellous Bone

Cancellous screws use a wider thread profile and a greater pitch than cortical screws. This design increases the surface area in contact with trabecular bone. Consequently, the screw achieves reliable purchase even in softer bone. This makes the partly threaded cannulated cancellous bone screw well suited for orthopedic and trauma applications in metaphyseal bone.

Materials

This orthopedic cannulated cancellous screw is available in two material options:

• High-quality Premium Gurman stainless steel
• Titanium

Available Sizes

Diameter options:
1.5mm, 2.0mm, 2.7mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, 6.0mm, 6.5mm, 7.0mm, 7.3mm, 8.0mm

Length options:
6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm, 34mm, 36mm, 38mm, 40mm, 42mm, 44mm, 46mm, 48mm, 50mm, 52mm, 54mm, 56mm, 58mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm

This range covers a wide spectrum of needs. Smaller diameters — such as the 1.5mm, 2.0mm, and 3.5mm — suit fine bone structures in the hand, wrist, and foot. Larger options, including the 6.5mm, 7.3mm, and 8.0mm, address bigger metaphyseal regions. Furthermore, lengths from 6mm to 110mm give surgeons and procurement teams wide flexibility in matching screw size to patient anatomy.

Use Context

Surgeons and surgical teams use the trauma cannulated cancellous screw in orthopedic and trauma procedures where guide wire-assisted, lag-type fixation in cancellous bone is required. The partly threaded design works specifically where threads must engage the distal fragment only. Moreover, the cannulated shaft allows for percutaneous technique, which helps limit soft tissue dissection.

Key Specifications

• Product type: Cannulated cancellous bone screw, partly threaded
• Thread configuration: Partial thread for lag screw compression
• Cannulation: Hollow shaft for guide wire delivery
• Materials: Premium Gurman stainless steel / Titanium
• Diameter range: 1.5mm to 8.0mm
• Length range: 6mm to 110mm

The Cannulated Cancellous Screw Partly Threaded from Sami’s Instruments serves a specific and well-established role in trauma and orthopedic fixation. The broad size range supports sourcing for varied case requirements. Both stainless steel and titanium options give procurement teams additional flexibility in material selection.