Interobserver Reliability of the Modified Radiographic Union Score for Tibial and Femoral Fractures.
Dominik Deppe1,2, Matteo Gabriele1,3, Manuel Giovanni Mazzoleni4
1Julius Wolff Institute, Berlin Institute of Health at Charité-Universitätsmedizin Berlin, Berlin, Germany.
Journal of Orthopaedic Trauma
|June 25, 2025
Summary
The modified Radiographic Union Score for Tibial fractures (mRUST) reliably monitors femur and tibia fracture healing. This radiographic score is effective regardless of fixation method, proving its generalizability for lower limb fractures.
Area of Science:
- Orthopedics
- Radiology
- Trauma Surgery
Background:
- Fracture healing assessment is crucial for patient outcomes.
- Standardized radiographic scoring systems aid in monitoring treatment progress.
- The modified Radiographic Union Score for Tibial fractures (mRUST) aims to improve reliability in assessing fracture union.
Purpose of the Study:
- To evaluate the reliability of the mRUST for monitoring femur and tibia fractures.
- To assess the mRUST's consistency across different fixation methods (nail, plate).
- To determine the generalizability of the mRUST for lower limb fracture healing assessment.
Main Methods:
- Retrospective analysis of adult patients with extra-articular lower extremity long bone fractures.
- Independent assessment of fracture line and callus growth by six international investigators.
- Calculation of inter-rater reliability using intraclass correlation coefficients (ICC).
Main Results:
- Overall inter-rater reliability for mRUST was good (ICC 0.77).
- Reliability remained consistent across nail (0.79) and plate (0.79) fixation methods.
- Good reliability was observed for both tibia (0.78) and femur (0.81) fractures.
Conclusions:
- The mRUST is a reliable radiographic tool for monitoring femur and tibia fracture healing.
- The score's reliability is independent of the fixation method used.
- mRUST is a generalizable tool for assessing lower limb fracture union.
