Ultra-low dose post-operative CT protocol after acetabular fixation has excellent intra- and inter-observer...

Area of Science:

• Orthopaedic Surgery
• Radiology
• Medical Imaging

Background:

• Acetabular fractures require precise imaging for post-operative assessment.
• Standard CT protocols involve significant radiation exposure.
• Optimizing radiation dose while maintaining diagnostic accuracy is crucial.

Purpose of the Study:

• To determine the lowest radiation dose CT protocol for evaluating post-operative acetabular fractures.
• To ensure the chosen protocol maintains high intra- and inter-observer reliability.

Main Methods:

• Cadaveric acetabuli with simulated fractures and fixation were scanned using progressively lower radiation doses.
• Five orthopaedic traumatologists assessed articular step-off, gap, implant penetration, and surgeon confidence.
• Radiation dose was varied by adjusting factors like mAs and pitch.

Main Results:

• The ultra-low dose CT protocol (1/10th of full dose) demonstrated excellent intra- and inter-observer reliability (>80%).
• Reliability for assessing step-off, gap, and implants ranged from 80-100%.
• Average difference in measurements between full and ultra-low dose protocols was minimal (0.42 mm).

Conclusions:

• An ultra-low dose CT protocol significantly reduces radiation exposure for post-operative acetabular fracture assessment.
• This protocol maintains high diagnostic reliability, comparable to standard full-dose scans.
• The findings support the use of ultra-low dose CT in routine clinical practice for these injuries.