Can a Rotator Cuff Tear on MRI Establish Vaccine-Related Injury?
A patient develops shoulder pain following vaccination. MRI is obtained several weeks later and shows a rotator cuff tear. Does that prove the vaccine caused the tear?
No.
The MRI establishes that a structural abnormality exists. It does not necessarily establish:
when the tear developed,
whether it was symptomatic beforehand, or
what caused it.
This distinction is particularly important in SIRVA because rotator cuff abnormalities are repeatedly reported in the literature, but they are also common shoulder findings independent of vaccination.
Rotator Cuff Pathology Is Reported in SIRVA
Rotator cuff involvement has appeared throughout the SIRVA literature. Hesse and colleagues' analysis of 476 conceded SIRVA claims found that common MRI findings included tendinopathy/tendinosis, rotator cuff tears, and bursitis. However, the authors explicitly warned that MRI findings should not be treated as prima facie evidence of a causally related vaccine injury because similar abnormalities are common in the age group represented by the cohort.
That caution is particularly relevant to partial-thickness supraspinatus tears and degenerative tendinopathy.
A tear discovered after vaccination may be temporally associated with the symptoms without having been structurally created by the injection.
The Critical Distinction: Structural Tear vs. Symptomatic Shoulder
A patient can have a rotator cuff tear without knowing it.
This creates at least three different possibilities when MRI is obtained after vaccination:
1. The tear was preexisting and remains incidental.
2. The tear was preexisting but became symptomatic following an acute inflammatory or mechanical event.
3. The tear itself represents a new injury related to the injection.
MRI obtained only after vaccination may not be able to distinguish among these possibilities.
This is why the SIRVA systematic review by Slette, Rohrback, and Ring emphasized the potential contribution of common incidental shoulder pathology to persistent post-vaccination symptoms. The paper is appropriately included in contemporary reviews as an important counterpoint to attributing structural abnormalities automatically to vaccination.
Preexisting Asymptomatic Tears Are a Major Causation Issue
Our SIRVA evidence extraction specifically identifies this limitation in several published cases.
For example, the Boonsri case report described subacromial-subdeltoid bursitis together with a supraspinatus tear following COVID-19 vaccination. In our review, the causation limitation was coded explicitly as:
“Pre-existing asymptomatic cuff tear cannot be excluded.”
That is an appropriate way to interpret many such cases. The presence of a tear may be real. The patient's symptoms may be real. The close relationship to vaccination may also be real. But those facts alone do not establish that the needle created the tear.
Can a Vaccine Needle Physically Reach the Rotator Cuff?
Potentially, yes. That is where injection anatomy becomes relevant.
Several structures of the rotator cuff lie beneath the deltoid and can theoretically be reached if the needle is positioned sufficiently high or penetrates deeply enough.
Natanzi and colleagues described two patients with immediate pain following vaccination and focal pathology involving the teres minor tendon insertion and adjacent humerus. They specifically mapped the tendon beneath the upper third of the deltoid and concluded that its location made overpenetration anatomically plausible.
In one of their cases, the patient had no prior musculoskeletal shoulder pain and experienced immediate pain during vaccination, with subsequent MRI demonstrating focal humeral edema.
Those features provide more mechanistic information than simply finding a common degenerative cuff tear months later.
What Makes a Tear More Concerning for Direct Needle Injury?
No finding proves the mechanism by itself, but concern for direct injury becomes stronger when several features align.
For example:
Immediate severe pain during needle insertion, plus
a focal tear or tendon abnormality at a location directly beneath the reported injection site, plus
adjacent edema, cortical change, or bone injury, plus
little evidence of chronic tendon degeneration, plus
a previously asymptomatic shoulder would be more supportive of an acute injection-related mechanism.
In contrast:
gradual symptoms, plus
a chronic-appearing supraspinatus tear, plus
muscle atrophy or longstanding degenerative change, plus
prior shoulder symptoms would provide much less support for a newly created needle injury.
These are clinical reasoning principles rather than validated diagnostic criteria.
Associated Findings May Matter More Than the Tear Alone
The MRI should not be reduced to the phrase:
“rotator cuff tear.”
The surrounding findings may provide important context. A tear accompanied by:
substantial subacromial/subdeltoid bursitis,
focal marrow edema,
cortical irregularity,
localized soft-tissue edema,
synovitis,
or an anatomically corresponding inflammatory abnormality
may raise different mechanistic questions than an isolated chronic tear with tendon retraction, muscle atrophy, or extensive degenerative disease.
This is illustrated by published SIRVA cases in which tendon abnormalities occurred together with bursitis or osseous injury.
Barnes, Ledford, and Hogan reported a young patient who developed shoulder pain within approximately two hours of influenza vaccination. Imaging demonstrated a combination of:
partial supraspinatus tearing,
cortical irregularity,
humeral head bone contusion, and
subacromial bursal effusion.
This combination was interpreted as compatible with vaccine overpenetration.
The significance is not simply the presence of a cuff tear. It is the cluster of acute focal findings in a young patient together with rapid symptom onset and plausible anatomy.
That is a stronger mechanistic argument than a cuff tear in isolation.
Newer MRI Data Show That Tears Can Also Evolve
The Obeidat MRI study adds another interesting dimension. Serial MRI data included one patient who initially had no rotator cuff tear but later demonstrated a new full-thickness supraspinatus tear. Another patient had a partial-thickness tear on the earlier study that later appeared healed.
These observations demonstrate that rotator cuff findings can change over time.
They do not, by themselves, establish that vaccination caused the later tear.
A tear developing long after vaccination could reflect progression of tendon disease, subsequent injury, biomechanical factors, or potentially an evolving inflammatory process. Serial imaging improves temporal information but does not eliminate the need for causal reasoning.
Timing Is Particularly Important
A tear found after vaccination should be interpreted in relation to both:
when symptoms began, and
when the MRI was obtained.
Consider two scenarios.
Scenario A
A previously asymptomatic patient experiences sharp pain during the injection, immediately loses shoulder function, and MRI shortly afterward shows a focal tendon injury corresponding to the suspected needle trajectory. That provides relatively strong temporal and anatomical support for direct trauma.
Scenario B
A patient develops gradually progressive shoulder symptoms several weeks after vaccination and MRI six months later demonstrates a degenerative partial-thickness supraspinatus tear.
The temporal relationship between vaccination and the structural tear itself is much less clear. These should not be assigned equal causal weight.
Does the Absence of Prior Shoulder Pain Prove the Tear Is New?
No. This is another common error.
A patient can truthfully have had:
no prior pain,
no functional limitation, and
no prior shoulder treatment
while still having a preexisting structural cuff abnormality.
Thus:
Previously asymptomatic does not necessarily mean structurally normal.
But the converse is equally important:
A preexisting structural abnormality does not necessarily mean the patient's new symptoms were preexisting.
That is why the causation question often shifts from:
“Did vaccination create this tear?
to:
“What caused this previously asymptomatic shoulder to become symptomatic at this particular time?”
Could Vaccination Aggravate a Preexisting Tear?
Potentially, but this represents a different causal proposition.
A patient could theoretically have an asymptomatic degenerative tear and then develop:
acute bursitis,
inflammatory tendinopathy,
synovitis,
or another periarticular inflammatory process
following an improperly placed injection.
The patient's subsequent symptoms might therefore relate to aggravation or activation of previously silent pathology, even if the vaccine did not physically create the tear.
That distinction should be explicit in a medical-legal analysis.
There is an important difference between saying:
“The vaccine caused the rotator cuff tear.”
and:
“The patient had a potentially preexisting cuff abnormality, but an acute vaccine-associated shoulder event may have rendered that previously asymptomatic pathology clinically symptomatic.”
The second claim requires its own evidentiary support but is conceptually different from asserting a new structural tear.
Some Published Cases Have Delayed Timing
Our evidence database includes a reported partial infraspinatus tear with bursitis following mRNA vaccination in which symptom onset occurred approximately two weeks later. The extraction specifically notes both delayed onset and the possibility of a preexisting asymptomatic tear as causation limitations.
That case illustrates why simply seeing “tear + vaccination” in a published case report is insufficient. The quality of the causal inference depends on the details.
Why Systematic Reviews Matter
Case reports are useful for establishing that unusual clinical scenarios are possible.
They cannot determine how frequently a cuff tear discovered after vaccination was truly:
new,
preexisting,
incidental,
aggravated,
or unrelated.
Systematic reviews by Slette et al., MacMahon et al., and Wright et al. have therefore emphasized the heterogeneous and generally low-level nature of much of the SIRVA evidence. Slette's review is particularly relevant because it directly addresses the problem of common incidental pathology.
What Evidence Would Be Most Persuasive?
The strongest evidence that vaccination caused a new structural rotator cuff injury would ideally include:
recent pre-vaccination imaging showing an intact tendon, followed by
a documented injection event, followed by
immediate ipsilateral symptoms, followed by
early post-vaccination imaging demonstrating a new focal tear in an anatomically plausible location.
That combination is rarely available. Without pre-vaccination imaging, the age of many rotator cuff tears cannot be established with certainty.
MRI Can Support Causation Without Proving It
This is the important middle ground. MRI may support a causal hypothesis when:
pathology corresponds anatomically to the reported injection site,
imaging appears acute rather than longstanding,
associated inflammatory or osseous changes are present,
symptoms began immediately or rapidly,
there was no prior shoulder dysfunction,
and no more persuasive alternative explanation exists.
But the MRI should be interpreted as one component of the causal chain, not as the conclusion itself.
The Bottom Line
So, can a rotator cuff tear on MRI establish vaccine-related injury?
Not by itself.
A post-vaccination rotator cuff tear may represent:
a new direct injury,
a preexisting asymptomatic tear,
an aggravation of preexisting pathology,
a structural abnormality unrelated to the patient's pain, or
coincidental progression of ordinary rotator cuff disease.
The most defensible approach is to separate two questions:
Did vaccination create the structural tear?
from
Did vaccination cause or materially contribute to the patient's new shoulder symptoms?
Those questions may have different answers. For an individual case, the strength of causation depends on the integration of prior shoulder status, timing, injection anatomy, MRI characteristics, associated findings, serial imaging when available, and alternative explanations.
The MRI can provide important objective evidence. It cannot determine causation simply by showing a tear.
References
Atanasoff S, Ryan T, Lightfoot R, Johann-Liang R. Shoulder injury related to vaccine administration (SIRVA). Vaccine. 2010;28(51):8049-8052.
Barnes MG, Ledford C, Hogan K. A “needling” problem: shoulder injury related to vaccine administration. J Am Board Fam Med. 2012;25(6):919-922.
Hesse EM, Atanasoff S, Hibbs BF, et al. Shoulder Injury Related to Vaccine Administration (SIRVA): petitioner claims to the National Vaccine Injury Compensation Program, 2010-2016. Vaccine. 2020;38(5):1076-1083.
Natanzi N, Hebroni F, Bodor M. Teres minor injury related to vaccine administration. Radiol Case Rep. 2020;15(5):552-555.
Boonsri P, Chuaychoosakoon C. Combined subacromial-subdeltoid bursitis and supraspinatus tear following a COVID-19 vaccination: a case report. Ann Med Surg (Lond). 2021;69:102819.
Slette E, Rohrback M, Ring D. Persistent shoulder pain after vaccine administration is associated with common incidental pathology: a systematic review. Clin Orthop Relat Res. 2022;480(7):1251-1258.
MacMahon A, Nayar SK, Srikumaran U. What do we know about shoulder injury related to vaccine administration? An updated systematic review. Clin Orthop Relat Res. 2022;480(7):1241-1250.
Wright JO, Wiggins W, Smith MS, King JJ, Wright TW. Shoulder pain and dysfunction after vaccination: a systematic review. JBJS Rev. 2023;11(1).
Chuaychoosakoon C, et al. Partial infraspinatus tear with bursitis following an mRNA vaccination: a case report. Ann Med Surg (Lond). 2023. Apr 17;85(5):2159-2161.
Obeidat N, Khasawneh R, Alrawashdeh A, et al. Shoulder Injury Related to Vaccine Administration (SIRVA) following COVID-19 vaccination: correlating MRI findings with patient demographics. Tomography. 2025;11(5):53.
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