Related Experiment Video
Updated: Feb 12, 2026
Nerve Ultrasound Protocol to Detect Dysimmune Neuropathies
Published on: October 7, 2021
3-Tesla MRI-assisted detection of compression points in ulnar neuropathy at the elbow in correlation with
Alina Hold1, Michael S Mayr-Riedler1, Thomas Rath1
1Division of Plastic and Reconstructive Surgery, Department of Surgery, Medical University of Vienna, Waehringer Guertel 18-20, Vienna 1090, Austria.
Introduction:
Releasing the ulnar nerve from all entrapments is the primary objective of every surgical method in ulnar neuropathy at the elbow (UNE). The aim of this retrospective diagnostic study was to validate preoperative 3-Tesla MRI results by comparing the MRI findings with the intraoperative aspects during endoscopic-assisted or open surgery.
Methods:
Preoperative MRI studies were assessed by a radiologist not informed about intraoperative findings in request for the exact site of nerve compression. The localizations of compression were then correlated with the intraoperative findings obtained from the operative records. Percent agreement and Cohen's kappa (κ) values were calculated.
Results:
From a total of 41 elbows, there was a complete agreement in 27 (65.8%) cases and a partial agreement in another 12 (29.3%) cases. Cohen's kappa showed fair-to-moderate agreement.
Conclusion:
High-resolution MRI cannot replace thorough intraoperative visualization of the ulnar nerve and its surrounding structures but may provide valuable information in ambiguous cases or relapses.
Related Concept Videos
02:20Correlations
01:27Correlation and Causation
Correlation versus Causation
If the dependent variable increases or decreases when the independent variable increases, there is a positive or negative...
01:09Correlation
Two variables, for example, a and b, are said to be positively correlated if both variables move in the same direction. In other words, a positive correlation exists between two variables, a and b, if:
01:03Finding the Center of Gravity
01:29Cardiovascular System Abnormal Findings I: Inspection and Palpation
Abnormal findings observed during an inspection
01:30Respiratory System Abnormal Finding I: Inspection and Percussion
Inspection Findings
During an inspection, several findings may suggest the presence of respiratory distress or disease. Pursed-lip breathing, where exhalation is slowed by...