Incidence and characteristics among individuals developing frozen shoulder following COVID-19 vaccine administration:...

Perform a systematic review to determine incidence and characteristics of vaccine administration of those developing frozen shoulder (FS) following COVID-19 vaccine administration.

Systematic review of the literature (PROSPERO number CRD42024611140). Inclusion criteria; diagnosis of frozen shoulder, published or available in the English language and onset of frozen shoulder linked to COVID-19 vaccination. Studies were excluded if FS was linked to onset outside of vaccination and if data were not separated. Relevant studies were assessed for inclusion and selected studies were identified from PubMed, EMBASE, EBSCOhost, Cochrane Library, Web of Science and CINAHL databases. The search strategy was developed by a biomedical librarian run on August 4, 2025. Data were extracted from retained studies and underwent quality assessment using The Joanna Briggs Institute Critical Appraisal Checklist.

The search resulted in 1,506 studies and 9 retained for appraisal. A total of 140 individuals were identified among the retained studies with past medical history being reported in 6 of these studies identifying diabetes and hypothyroidism among the most common. Vaccine manufacturer and symptom manifestation data were reported in all retained studies. Incidence could not be determined based on available data.

In addition to known risk factors associated with vaccinations, those with comorbidities associated with the etiology of FS may also be predisposed to developing FS following COVID-19 vaccination administration. Clinicians evaluating those with suspected FS should be aware of the link between vaccinations and the development of FS. Additionally, clinicians administering COVID-19 vaccinations and boosters need to be aware of potential risk factors that may predispose individuals to developing FS following as well as possible signs and symptoms to be aware of post-vaccination.