Analysis of 2.0 and 3.5 mm Cortical Bone Screw Dimensions

Area of Science:

• Veterinary Orthopaedics
• Biomaterials Engineering
• Manufacturing Quality Control

Background:

• Quality assessment of veterinary orthopaedic implants is often overlooked, despite their importance for successful clinical outcomes.
• Dimensional accuracy of bone screws is critical for ensuring stable screw-bone integration.

Purpose of the Study:

• To evaluate the dimensional consistency of commonly used veterinary bone screws.
• To identify variations in major diameter and pitch within and between screws.

Main Methods:

• Sixty unused stainless steel cortical screws (2.0 mm and 3.5 mm) were microscopically examined.
• Six measurements of major diameter and pitch were taken from three regions along each screw.
• Measurements were compared against standard tolerance ranges.

Main Results:

• Significant percentages of 2.0 mm and 3.5 mm screws fell outside tolerance ranges for major diameter and pitch.
• Most screws exhibited dimensional variations along their length, indicating manufacturing variability.
• Suboptimal manufacturing quality was observed in the tested veterinary bone screws.

Conclusions:

• Considerable dimensional variability exists in veterinary bone screws, potentially compromising screw-bone interface integrity.
• The findings underscore the need for enhanced quality control in veterinary orthopaedic implant manufacturing.
• Improved manufacturing processes are essential for ensuring the clinical performance of veterinary bone screws.