Biomechanical properties of new mini compression screws
Related Experiment Video
Updated: Jun 22, 2026

A Minimally Invasive Model to Analyze Endochondral Fracture Healing in Mice Under Standardized Biomechanical Conditions
Published on: March 22, 2018
Background:
The aim of the current study was to compare the compression forces achieved by the new commercial mini compression screws in cortical and cancellous bone.
Materials And Methods:
The following screws were tested: AO partially threaded 4-mm cancellous screw, AO 3.5- and 2.7-mm cortical screws (Synthes - USA) , self-tapping cannulated 3-mm VisAntares (EOS - France), 3- and 2.3-mm Omnitech (Biotech - France), 3-mm Barouk (DePuy - France), and 3-mm Bold screws (Newdeal - France). The compression forces of screws in bone were tested using a load cell between pieces of longitudinally-split sheep tibias as a cortical and cancellous bone model.
Results:
The AO 3.5-mm, 2.7-mm cortical and 4.0-mm partially threaded cancellous headed screws provided significantly (p < = 0.05) better compression forces than all the tested headless screws, both in cortical and cancellous bone. A loss of compression was noted when the headless screws were totally countersunk.
Conclusion:
The cortical and cancellous screws with heads provided superior compression than headless screws.
Clinical Relevance:
Headed screws may be preferable to headless differential pitch screws in situations where compression is important ie, arthrodeses or fracture fixation. Care should be taken not to countersink the headless screws during insertion into cortical bone.
Related Concept Videos
Frictional Forces on Screws
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...
Self-Locking Screw
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.
Screw: Problem Solving
To evaluate the...
Upward Impending Motion
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
Bending of Members Made of Several Materials
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each material's...
Wood Fasteners
Nails are the most common fasteners, consisting of sharp-pointed metal pins that are driven into wood using a hammer or a mechanical nail gun. They come in a variety of diameters, heads, and lengths. Nailing techniques include...
