Sliding external fixator "a product design and cadaveric experiment".

Area of Science:

• Orthopedic surgery
• Biomedical engineering
• Biomechanics

Background:

• External fixation for elbow joints is established but requires precise alignment of the fixator's center of rotation with the elbow's.
• Current methods mandate X-ray guidance for accurate center of rotation identification, complicating the procedure.
• A new sliding external fixation design aims to eliminate the need for center of rotation identification.

Purpose of the Study:

• To evaluate a novel sliding external fixation system for elbow joints.
• To determine if the sliding fixator can maintain joint mobility and congruence without precise center of rotation alignment.
• To assess the device's efficacy in dislocated elbow scenarios.

Main Methods:

• A cadaveric study was conducted using a sliding fixator prototype.
• Two cadaveric elbow specimens were tested throughout their range of motion.
• The fixator was applied to intact and surgically dislocated elbows.

Main Results:

• Assembly of the sliding fixator on intact elbows did not impede joint movement.
• The fixator successfully maintained elbow joint congruence throughout the movement arc, even after surgical dislocation.
• No X-ray guidance was required for the application of the sliding fixator.

Conclusions:

• A sliding external fixator can be applied to the extensor aspect of a joint without identifying the center of rotation.
• This novel fixation method does not impede joint movement.
• The device effectively maintains congruence in dislocated joints under distraction forces.