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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. This study validates REST, showing it improves diagnostic accuracy and reliability compared to clinical gestalt alone.
Area of Science:
- Radiology
- Oncology
- Orthopedic Surgery
Background:
- The Radiological Evaluation Score for Bone Tumors (REST) is a validated tool for assessing bone lesions.
- Accurate differentiation between benign and malignant bone tumors is crucial for appropriate patient management.
Purpose of the Study:
- To externally validate the REST system's diagnostic accuracy.
- To compare the REST system's performance against clinical gestalt among reviewers with varying experience levels.
Main Methods:
- 104 primary bone tumor radiographs were reviewed by two independent groups of radiologists.
- One group used the REST system, while the other relied on clinical gestalt.
- Histopathological reports served as the reference standard for diagnosis.
Main Results:
- The REST system demonstrated higher sensitivity (80.8%) and specificity (84.6%) for malignant bone lesions compared to clinical gestalt (63.5% sensitivity, 90.4% specificity).
- The REST group showed significantly better interobserver reliability (0.738) than the clinical gestalt group (0.446).
- While not statistically significant, the Area Under the Curve favored the REST score.
Conclusions:
- The REST system is a valuable radiographic tool for the systematic evaluation of bone lesions.
- REST enhances diagnostic accuracy and reliability in identifying malignant bone tumors.