Quantitative MR imaging in fracture dating--Initial results.

Area of Science:

• Orthopedic research
• Forensic medicine
• Medical imaging

Background:

• Accurate bone fracture age determination is crucial in forensic contexts, such as child abuse cases.
• Current methods rely on subjective radiographic assessments of callus formation.
• There is a need for objective, non-invasive imaging techniques for fracture dating.

Purpose of the Study:

• To evaluate the applicability of magnetic resonance imaging (MRI) for objective bone fracture age determination.
• To investigate time-resolved changes in quantitative MRI characteristics following a fracture event.
• To develop a novel model for fracture age estimation using MRI data.

Main Methods:

• 31 MRI examinations were performed on 17 adult subjects with conservatively treated long bone or collar bone fractures.
• Quantitative MRI measurements of T1 and T2 relaxation times were acquired in the fracture gap and surrounding musculature.
• Maps of T1, T2, and Magnetisation Transfer Ratio (MTR) were calculated and analyzed over time using regions of interest (ROIs).

Main Results:

• Quantitative analysis of 23 datasets revealed an initial peak in T1 values (1895 ± 607 ms) in the fracture gap, decreasing to 1094 ± 182 ms by 200 days.
• T2 values peaked in early fractures (115 ± 80 ms) and decreased to 73 ± 33 ms within 21 days, with no significant changes thereafter.
• Magnetisation Transfer Ratio (MTR) remained stable at 35.5 ± 8.0% throughout the observation period.

Conclusions:

• Quantitative assessment of temporal changes in T1 and T2 relaxation times in fractured bone regions provides a basis for objective fracture age determination.
• This study demonstrates the potential of MRI as a novel, non-invasive tool for forensic fracture dating.
• The developed model using quantitative MRI parameters offers a more objective alternative to current subjective methods.