Related Experiment Video
Updated: May 18, 2026
Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
Published on: March 12, 2021
Kinematic shoulder MRI: the diagnostic value in acute shoulder dislocations
Marshall Marcus1, Amit Malhotra, Moshe Peri
1Internal Medicine, Johns Hopkins University/Sinai Hospital of Baltimore, Baltimore, MD, USA. MarshallMarcus@gmail.com
Objectives:
To determine whether positioning of the arm in adduction and internal rotation would improve the confidence in the diagnosis of Bankart lesions in first time shoulder dislocators.
Methods:
Eleven patients were imaged on an open bore MRI within 1-6 days of traumatic shoulder dislocation with the arm adducted and internally rotated, and subsequently the patients were reimaged with the arm adduced and externally rotated. Two blinded musculoskeletal radiologists determined the confidence of diagnosing labral tears in each of the two positions.
Results:
An anterior-inferior labral tear was diagnosed in 11/11 patients in internal rotation and in 6/11 patients in external rotation. The average confidence was 2.8 in internal rotation and 1.5 in external rotation (on a scale of 0-3). Using a Wilcoxon signed rank test, the certainty of the diagnosis was determined to be significantly higher with the arm in internal rotation (P = 0.016).
Conclusions:
MRI performed with the arm in internal rotation for patients with acute first time anterior shoulder dislocation increases the certainty of the diagnosis of anterior-inferior labral tears.
