Approximately 10% of 1,927 cases of uveitis have been found to have associated joint disease. These and an additional 13 children with iridocyclitis but without joint disease have been studied.
Samuel J. Kimura, Michael J. Hogan, G. Richard O'Connor, Wallace V. Epstein. Uveitis and Joint DiseasesClinical Findings in 191 Cases. Arch Ophthalmol. 1967;77(3):309–316. doi:10.1001/archopht.1967.00980020311004