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Observer reliability in ankle radiographic measurements
M E Brage1, C R Bennett, J B Whitehurst
1University of Chicago Hospitals and Clinics, Illinois 60637, USA.
Foot & Ankle International
|June 1, 1997
Summary
This study found that most ankle radiograph measurements are reliable between observers and within observers. Examiner experience improves intraobserver reliability for these common ankle fracture and normal ankle measurements.
Area of Science:
- Orthopedic Surgery
- Radiology
- Medical Imaging Analysis
Background:
- Accurate radiographic measurements are crucial for diagnosing and managing ankle injuries.
- Assessing the reliability of these measurements is essential for consistent clinical practice.
Purpose of the Study:
- To evaluate the interobserver and intraobserver reliability of common linear and angular measurements on ankle radiographs.
- To assess the reliability of specific measurements in both normal and fractured ankle cases.
Main Methods:
- Analysis of 50 sets of ankle radiographs (25 normal, 25 fractured).
- Four independent observers evaluated six standard radiographic parameters and four fracture displacement parameters on two separate occasions.
- Reliability assessed using analysis of variance intraclass correlation coefficient.
Main Results:
- Nine out of ten measured radiographic parameters demonstrated reliable interobserver and intraobserver agreement.
- Intraobserver reliability showed a positive correlation with the examiner's experience.
- Specific measurements included syndesmosis parameters, medial clear space, talocrural angle, bimalleolar angle, and malleolar displacement.
Conclusions:
- Most common linear and angular measurements on ankle radiographs are reliable for clinical use.
- Radiographic measurement reliability is influenced by examiner experience, with more experienced clinicians showing higher intraobserver reliability.
- These findings support the consistent application of standardized radiographic measurements in ankle fracture assessment.