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Direct electromagnetic coupling to determine diagnostic bone fracture stiffness.
Jakob G Wolynski1, Milan M Ilić2, Kevin M Labus1
1Orthopaedic Bioengineering Research Laboratory, Departments of Mechanical Engineering and School of Biomedical Engineering, Colorado State University, Fort Collins, Colorado, USA.
Annals of Translational Medicine
|August 5, 2022
Summary
A new diagnostic device accurately measures bone fracture stiffness noninvasively. This technology aids in early prediction of healing outcomes, improving patient care and reducing recovery times.
Area of Science:
- Orthopedics
- Biomedical Engineering
- Materials Science
Background:
- Accurate prediction of adverse bone fracture healing outcomes (nonunion, delayed union) is crucial for timely intervention.
- Current radiographic methods are ineffective for early healing assessment, delaying nonunion diagnosis beyond six months.
- A novel noninvasive diagnostic device utilizing telemetric measurements of fracture bending stiffness was developed to address this clinical gap.
Purpose of the Study:
- To evaluate the accuracy of a novel diagnostic antenna system in measuring temporal fracture healing stiffness.
- To assess the utility of telemetric stiffness measurements for expedited prediction of fracture healing outcomes within three weeks of recovery.
Main Methods:
- Simulated fracture repair in ovine metatarsals by progressively destabilizing cadaveric specimens stabilized with locking plates.
- Measured bending stiffness using a direct electromagnetic coupling diagnostic system and compared results with material testing (MT) methods.
- Explored clinical feasibility via parametric finite element (FE) analyses (n=1,632 simulations) modeling implant mechanics under various fracture and fixation conditions.
Main Results:
- Stiffness values predicted by the electromagnetic coupling system showed no significant difference compared to in vitro MT methods across intact, destabilized, and fully fractured states.
- Total implant deflection reduction measurements closely aligned between the electromagnetic coupling system (82.2 µm) and FE predictions (74.7 µm).
- FE analyses indicated a nonlinear reduction in implant midspan deflections with increasing callus stiffness across all simulated treatment parameters.
Conclusions:
- The developed technology shows potential as a noninvasive clinical tool for accurate quantification of healing fracture stiffness.
- This method can augment and expedite healing outcome predictions currently reliant on radiographic imaging.
- Early and accurate assessment of fracture healing can lead to improved patient management and therapeutic strategies.
