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Rotator Cuff Muscular Edema in Human: A Clinical and Radiological Analysis From the LaTour Group.
Jeanni Zbinden1,2, Frank C Kolo3, Alberto Guizzi4
1Division of Orthopedics and Trauma Surgery, La Tour Hospital, Meyrin, Geneva, Switzerland.
Orthopaedic Journal of Sports Medicine
|August 18, 2025
Summary
Muscle edema in rotator cuff injuries can now be identified in humans using MRI/MRA. This imaging helps differentiate acute tears from chronic ones based on age and time to MRI.
Area of Science:
- Orthopedics
- Radiology
- Sports Medicine
Background:
- Rotator cuff injuries can lead to muscle edema.
- Previous studies demonstrated this in animal models.
- Human studies are needed to confirm this phenomenon.
Purpose of the Study:
- To analyze rotator cuff muscle edema in humans using MRI/MRA.
- To differentiate acute rotator cuff injuries from acute-on-chronic injuries.
Main Methods:
- Cross-sectional study with Level 3 evidence.
- Analyzed demographic, clinical, and radiological data of 71 shoulders.
- Grouped patients into acute (minimal fatty infiltration) and acute-on-chronic (significant fatty infiltration) categories.
Main Results:
- 45 shoulders (63.4%) were acute lesions, 26 (36.6%) were acute-on-chronic.
- The acute group was younger (60 vs 68 years) and had earlier MRIs (23 vs 42 days post-trauma).
- Edema location, lesion type, and tendon retraction did not differentiate groups.
Conclusions:
- Muscle edema, along with fatty infiltration and patient age, helps distinguish new rotator cuff tears from exacerbations of chronic ones.
- The time between symptom onset and MRI/MRA is also a key differentiating factor.
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