The rotational fixator: A new device.

Area of Science:

• Orthopedic surgery
• Biomechanical engineering
• Medical device development

Background:

• Malrotation is a frequent complication following surgical treatment of femoral shaft fractures.
• This complication often necessitates further procedures with unpredictable results.

Purpose of the Study:

• To validate a novel device, the Rotational Fixator, for accurate and safe correction of rotational deformities.
• To assess the device's performance in comparison to standard measurement tools.

Main Methods:

• An in-vitro study was conducted using 21 cadaveric bone specimens.
• The Rotational Fixator's accuracy was tested against a standard goniometer.
• Rotational measurements were performed from 10° to 30° for both internal and external rotation.

Main Results:

• The Rotational Fixator demonstrated a small measurement inaccuracy, ranging from 1-2°.
• Accuracy was consistent across different rotation degrees and directions.
• Specific inaccuracies noted: 10° internal rotation (0.95° ± 1.07°), 10° external rotation (0.59° ± 0.68°), up to 30° (IR 1.67°, ER 1.50°).

Conclusions:

• The Rotational Fixator exhibits constant deviation but consistent measurement error compared to the gold standard.
• The device's performance suggests its suitability for further investigation.
• In vivo studies are recommended to further evaluate the Rotational Fixator's clinical utility.