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    <publishedYear>2025</publishedYear>
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    <language>eng</language>
    <pageFirst>557</pageFirst>
    <pageLast>563</pageLast>
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    <edition/>
    <issue>10</issue>
    <volume>39</volume>
    <type>article</type>
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    <title language="eng">Interobserver Reliability of the Modified Radiographic Union Score (mRUST) for Tibial and Femoral Fractures</title>
    <abstract language="eng">OBJECTIVES: &#13;
&#13;
To evaluate the reliability of the modified Radiographic Union Score for Tibial fractures (mRUST) as a reliable tool for monitoring lower limb fractures (femur, tibia) treated with various modalities (nail, plate).&#13;
&#13;
METHODS: &#13;
Design: &#13;
Retrospective analysis.&#13;
&#13;
Setting: &#13;
Single center academic hospital in Germany.&#13;
&#13;
Patient Selection Criteria: &#13;
Adult patients (≥18 years) with extra-articular long bone fractures of the lower extremities treated surgically between January 2005 and April 2022, requiring radiographs in two perpendicular planes and at least one follow-up visit, were included. Exclusion criteria were critical clinical conditions, inability to consent, joint articulation fractures, inadequate documentation, or insufficient imaging quality.&#13;
Outcome Measures and Comparisons: &#13;
&#13;
Six international investigators (five orthopedic surgeons, one radiologist) independently assessed fracture line and callus growth per cortex (mRUST) at individualized follow-up time points based on clinical practice. To evaluate interrater reliability, intraclass correlation coefficients were calculated for the overall dataset, and for subsets of rated images, that were defined based on anatomical location (femur/tibia), treatment type (plate/nail fixation), and treatment combinations across locations.&#13;
&#13;
RESULTS: &#13;
A total of 166 patients (63 femur fractures, 103 tibia fractures; 32.5% female, mean age 43.4 (18–84)) with 1136 follow-up time points were analyzed. Overall interrater reliability for mRUST was good (intraclass correlation coefficient 0.77), consistent across fixation methods (nail/plate fixation, 0.79) and anatomical locations (tibia, 0.78; femur, 0.81). Cortex-specific reliability varied, with highest agreement for the medial cortex (0.70–0.74) and lowest for the posterior cortex (0.65–0.74).&#13;
&#13;
CONCLUSIONS: &#13;
The mRUST (radiographic score) demonstrated reliability for monitoring fracture healing in the femur and tibia, irrespective of fixation method, supporting its use as a generalizable tool across lower limb fractures.&#13;
&#13;
LEVEL OF EVIDENCE: &#13;
Prognostic Level III. See Instructions for Authors for a complete description of levels of evidence.</abstract>
    <parentTitle language="eng">Journal of Orthopaedic Trauma</parentTitle>
    <identifier type="doi">10.1097/BOT.0000000000003032</identifier>
    <identifier type="issn">0890-5339</identifier>
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