[Bone biopsy needles: mechanical properties, needle design and specimen quality]

Area of Science:

• Orthopedics and Biomedical Engineering
• Surgical Instrument Analysis

Background:

• Bone biopsy is crucial for diagnosing bone diseases.
• Needle performance variability can impact diagnostic accuracy and patient outcomes.
• Objective assessment of bone biopsy needles is needed.

Purpose of the Study:

• To quantitatively compare mechanical properties of bone biopsy needles.
• To evaluate needle design, wear, handling, and specimen quality.
• To identify factors influencing bone biopsy needle performance.

Main Methods:

• Nineteen different bone biopsy systems (38 needles) were tested.
• Mechanical properties were measured using force-torque sensors during swine vertebral body punctures.
• Needle wear was assessed using a profile projector; specimen quality was evaluated by a pathologist.

Main Results:

• Needle diameter and design significantly influenced mechanical properties (p=0.003, p=0.008).
• The Franseen needle design demonstrated superior performance compared to others.
• Significant differences in needle length reduction (wear) were observed between designs.

Conclusions:

• Bone biopsy needles exhibit significant performance variations.
• Needle design is a critical factor affecting mechanical properties, handling, and specimen quality.
• Understanding these parameters aids in selecting optimal bone biopsy needles.