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Absorbable scaphoid screw development: a comparative study on biomechanics.

Yi Wang¹, Muguo Song¹, Yongqing Xu¹

¹Department of Orthopedic Surgery, Kunming General Hospital, Chengdu Military Command, People's Liberation Army, Kunming, Yunnan, People's Republic of China.

Therapeutics and Clinical Risk Management

|May 25, 2016

Summary

A novel absorbable scaphoid screw (ASS) demonstrated superior biomechanical stability for scaphoid waist fractures compared to traditional Kirschner wires. This innovative fixation method offers promising results for wrist fracture treatment.

Keywords:

Kirschner wires absorbable scaphoid screw biomechanics internal fixator

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Area of Science:

Orthopedic Surgery
Biomaterials Engineering
Biomechanics

Background:

The scaphoid bone is crucial for wrist stability and mobility.
Scaphoid waist fractures are common and require stable fixation.
Current fixation methods may have limitations.

Purpose of the Study:

To develop and biomechanically evaluate a new absorbable scaphoid screw (ASS) for scaphoid waist fracture fixation.
To compare the ASS fixation with traditional Kirschner wire fixation.

Main Methods:

An ASS was fabricated from polylactic acids, designed for scaphoid anatomy.
Twenty fractured scaphoid waist specimens were divided into ASS and K-wire groups.
Biomechanical testing included cyclic loading (palmar flexion/dorsal extension) and measurement of fracture gap displacement and material strength.

Main Results:

The ASS group showed significantly less fracture gap displacement after fatigue testing (0.21±0.03 mm vs. 1.52±0.07 mm).
The ASS exhibited higher tensile strength (0.95±0.02 MPa) compared to the K-wire group (0.63±0.02 MPa).
Initial fracture gap displacement was also lower in the ASS group before fatigue testing.

Conclusions:

The absorbable scaphoid screw (ASS) provides adequate mechanical support for scaphoid waist fractures.
ASS fixation demonstrates superior stability and strength over Kirschner wires in biomechanical tests.
This absorbable screw represents a promising advancement in scaphoid fracture treatment.