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Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
Published on: March 12, 2021
Multidirectional instability of the shoulder: rotator interval dimension and capsular laxity evaluation using MR
Hui Jin Lee1, Na Ra Kim, Sung Gyu Moon
1Department of Radiology, Konkuk University School of Medicine, 4-12, Hwayang-dong, Gwangjin-gu, Seoul, 143-729, Korea.
Skeletal Radiology
|May 29, 2012
Summary
MR arthrography reveals that patients with multidirectional instability (MDI) have significantly larger rotator intervals and capsular dimensions compared to stable shoulders. These measurements can aid in diagnosing MDI.
Area of Science:
- Orthopedic imaging
- Shoulder biomechanics
- Radiology
Background:
- Multidirectional instability (MDI) is a common cause of shoulder pain and dysfunction.
- Accurate diagnosis of MDI is crucial for effective treatment.
- MR arthrography is a valuable tool for evaluating shoulder joint structures.
Purpose of the Study:
- To compare rotator interval and capsular dimensions using MR arthrography in patients with MDI versus controls.
- To determine if specific measurements can differentiate MDI shoulders from stable shoulders.
Main Methods:
- Retrospective review of 97 shoulders (47 MDI, 50 control) who underwent MR arthrography.
- Two independent observers measured rotator interval width/depth and capsular dimensions.
- Measurements were compared between MDI and control groups.
Main Results:
- Rotator interval width and depth were significantly greater in the MDI group (p < .001).
- Inferior and posteroinferior capsular dimensions were significantly larger in the MDI group (p < .05).
- Rotator interval measurements showed high sensitivity and moderate specificity for MDI detection.
Conclusions:
- MR arthrography demonstrates enlarged rotator intervals and capsular dimensions in shoulders with MDI.
- These quantitative MR arthrography findings can assist in the diagnosis of multidirectional shoulder instability.
