Rheumatology · Medical Literature
Milwaukee Shoulder Syndrome
Abstract
New England Journal of Medicine, Volume 395, Issue 5, Page 492-492, July 30, 2026.
Clinical relevance
What are the clinical presentation, radiographic features, and diagnostic hallmarks of Milwaukee Shoulder Syndrome in a middle-aged male patient with subacute shoulder pain and swelling? __SNAPSHOT__ {"studyDesign":"Clinical Images case report (NEJM 'Images in Clinical Medicine' series); single case vignette with radiographic correlation","setting":"Johns Hopkins School of Medicine, Baltimore, MD, USA; contributing author affiliation: Hacettepe University, Ankara, Turkey","sampleSize":"n=1 (single patient case report)","population":"A 45-year-old man with a 2-month history of worsening pain and swelling in the right shoulder. Age and sex are atypical for classical Milwaukee Shoulder Syndrome, which predominates in elderly women.","intervention":"Diagnostic evaluation including plain radiography; no therapeutic intervention reported in the available abstract","comparator":"Not applicable (single-arm observational case report)","primaryOutcome":"Radiographic and clinical characterization of Milwaukee Shoulder Syndrome; primary endpoint not formally defined (case report format)","followUp":"Not reported","fundingSource":"Not reported"}
Key findings
A 45-year-old man presented with a 2-month history of progressive right shoulder pain and swelling. Plain radiography demonstrated destruction of the humeral head with a free-floating humeral diaphysis — a finding consistent with severe, advanced Milwaukee Shoulder Syndrome (MSS). No quantitative outcomes, statistical comparisons, p-values, confidence intervals, or effect sizes are present or applicable in this case report format. The published abstract does not detail synovial fluid analysis, crystal identification, rotator cuff imaging, or treatment course. All interpretive conclusions beyond the described radiographic finding are not reported.
Practice implications
⚠️ Only the abstract and case vignette are publicly available; full clinical details, workup, management, and outcome are behind an institutional access paywall and cannot be assessed. This NEJM Clinical Images report illustrates an unusually severe and radiographically dramatic manifestation of Milwaukee Shoulder Syndrome in a 45-year-old man — a demographic (middle-aged male) that is underrepresented relative to the classical presentation in elderly women. MSS is a rare, destructive calcium hydroxyapatite (basic calcium phosphate) crystal arthropathy; the radiographic finding of humeral head destruction with a free-floating diaphysis represents an extreme end of the disease spectrum. This case does not establish incidence, treatment efficacy, or outcomes data. Findings apply only to the single described patient and cannot be generalized. The educational value lies in pattern recognition: clinicians should consider MSS in the differential of rapidly destructive shoulder arthropathy, even in younger or male patients. No change in management protocols is warranted from a single case report. __LIMITATIONS__ 1. Single case report — no comparative group, no control, no statistical inference possible. 2. Only the abstract is publicly available; clinical details, diagnostic workup, management, and outcome are not assessable. 3. The patient's demographics (45-year-old male) diverge from the classical MSS phenotype, limiting generalizability. 4. No synovial fluid analysis, rotator cuff imaging findings, or long-term follow-up are reported in the available text. 5. Publication in a high-impact journal's 'Images' section may amplify perceived significance of a single observation. 6. Funding source is not disclosed. 7. Case reports are at the lowest level of the evidence hierarchy and are hypothesis-generating only. __BOTTOM_LINE_CATEGORY__ low_certainty __BOTTOM_LINE__ This NEJM Clinical Images case report describes a radiographically severe presentation of Milwaukee Shoulder Syndrome — humeral head destruction with a free-floating diaphysis — in an atypically young (45-year-old) male patient. The case serves as a pattern-recognition teaching tool, reinforcing that MSS can present across a broader demographic than classically described. As a single case report with only abstract-level data available, no changes to diagnostic algorithms or treatment guidelines are supported.