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REST Framework in Action: Predicting Benign versus Malignant Bone Tumors-An External Validation Study
Duddukunta Vishal Reddy1, Ch Raja Bhaskar Venkata Sri Madhusudan1, Manish Kumar Shah1
1Department of Orthopedic Surgery, AIIMS (All India Institute of Medical Sciences), Shivaji Nagar, Rishikesh, Uttarakhand 249203 India.
Indian Journal of Orthopaedics
|July 22, 2026
Summary
The Radiological Evaluation Score for Bone Tumors (REST) system accurately identifies malignant bone lesions. External validation showed REST improves diagnostic accuracy and reliability compared to clinical gestalt alone.
Area of Science:
- Radiology
- Oncology
- Orthopedics
Background:
- The Radiological Evaluation Score for Bone Tumors (REST) is a validated tool for assessing bone lesions.
- External validation is crucial to confirm its utility across different clinical settings and experience levels.
Purpose of the Study:
- To externally validate the REST system.
- To compare the diagnostic accuracy of the REST system against clinical gestalt in identifying malignant bone lesions.
- To assess interobserver reliability for both methods.
Main Methods:
- 104 radiographs of primary bone tumors with histopathological confirmation were reviewed.
- Three reviewers used the REST system, while three others used clinical gestalt.
- Diagnostic accuracy (sensitivity, specificity) and interobserver reliability were calculated.
Main Results:
- The REST system demonstrated higher sensitivity (80.8%) and specificity (84.6%) for malignant bone lesions compared to clinical gestalt (63.5% and 90.4%, respectively).
- The REST group showed statistically significant improvement in diagnostic accuracy (p=0.017).
- Interobserver reliability was significantly higher in the REST group (0.738) than in the clinical gestalt group (0.446).
Conclusions:
- The REST system is a valuable radiographic tool for the systematic evaluation of bone lesions.
- It offers considerable diagnostic accuracy and improved reliability over clinical gestalt.
- REST can serve as a key step in diagnosing bone tumors.