Internal fixation of the distal radius. A comparative, experimental study

Area of Science:

• Orthopedic Surgery
• Biomaterials Science
• Biomechanics

Background:

• Distal radius fractures are common, necessitating effective internal fixation methods.
• Current fixation techniques vary in stability and biocompatibility.
• Evaluating novel biomaterials like polylactide rods as alternatives to Kirschner wires (K-wires) is crucial.

Purpose of the Study:

• To experimentally compare the stability of different internal fixation devices for distal radius fractures.
• To assess the suitability of polylactide rods as a potential substitute for K-wires.

Main Methods:

• A comparative experimental study involving 60 human cadaver radii.
• Evaluation of fixation stability for various procedures, including Kirschner wires (K-wires) of different diameters and polylactide/polyglycolide rods.
• Focus on fractures treated with a dorsal wedge fixation technique.

Main Results:

• 2.5-mm K-wires provided 10% greater stability than 1.8-mm K-wires.
• 2.7-mm polylactide rods showed slightly better stability than 1.8-mm K-wires under precise pinning.
• Shorter polylactide rods and polyglycolide rods were significantly less stable than 1.8-mm K-wires and plate fixation; however, 60 mm length 2.7-mm polylactide rods met stability requirements.

Conclusions:

• While shorter polylactide implants lack sufficient bone purchase, 60 mm length 2.7-mm polylactide rods demonstrate comparable stability to K-wires for distal radius fractures.
• These findings suggest potential for specific polylactide rod designs as viable alternatives in distal radius fracture fixation.