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Sh&A

1-chora: What is a Full Threaded Cannulated Screw and what is its primary design feature?

A1: A Full Threaded Cannulated Screw is an orthopedic implant that features a hollow central canal (cannulation) along its entire length, combined with continuous threading from tip to head. This unique design allows it to be inserted over a pre-placed guide wire while providing compression along the entire bone-implant interface.

2-savol: What are the main clinical advantages of the fully threaded cannulated design?

A2: Key advantages include:

Precise Placement: Guided insertion over a K-wire ensures accurate screw positioning

Continuous Compression: Provides uniform compression across the entire fracture line

Reduced Migration Risk: Full threading minimizes screw backing-out compared to partially threaded designs

Minimally Invasive: Enables percutaneous insertion for reduced tissue damage

So'ymoq: In which surgical procedures are Full Threaded Cannulated Screws most commonly used?

A3: They are particularly valuable in:

Hip Fracture Fixation: Femoral neck and intertrochanteric fractures

Pelvic and Acetabular Surgery: Sacroiliac joint fixation, pelvic ring fractures

Foot and Ankle Surgery: Subtalar arthrodesis, fracture fixation

Small Bone Fixation: Scaphoid, radial head, and other periarticular fractures

Q4: How does the biomechanical performance compare to partially threaded cannulated screws?

A4: Full threaded screws provide:

Superior Pull-out Resistance: Continuous threads maximize bone purchase

Reduced Stress Shielding: More even stress distribution along the screw length

Better Osteoporotic Bone Fixation: Enhanced holding power in poor quality bone

Elimination of “Lag Effect” Limitations: No stress concentration at thread-shaft junction

Q5: What are the potential challenges or limitations of using Full Threaded Cannulated Screws?

A5: Main considerations include:

Reduced Fracture Compression: Cannot generate the same lag effect as partially threaded screws

Insertion Torque: Higher resistance during insertion due to full threading

Narx: Typically more expensive than standard partially threaded screws

O'rganish egri: Requires different surgical technique for optimal use

Chora: How does the cannulation affect the screw’s mechanical strength?

A6: The hollow design reduces:

Torsional Strength: Approximately 15-30% reduction compared to solid screws

Bending Stiffness: Decreased resistance to bending forces

Fatigue Resistance: Potentially reduced in high-stress applications
Ammo, modern designs with optimized wall thickness maintain sufficient strength for most clinical applications.