Compared to new-onset arthritis from the vaccine - the biggest lit review I can find found 45 confirmed cases across 31 studies. [1] For comparison there are over 730,000 (self reported, admittedly) cases of long covid lasting more than 104 weeks in the UK alone. [2]
[1]: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10055862/
[2]: https://www.ons.gov.uk/peoplepopulationandcommunity/healthan...