Ulnar Capping

Ulnar capping refers to productive bone changes that may be seen at the ulnar stylus in a minority of patients with long-term rheumatoid arthritis (RA). It is the exception to the rule that productive changes are not seen in RA.

References

Manaster BJ, Disler DG, May DA, Sartoris DJ. Musculoskeletal Imaging, The requisites. Second Edition. pp106-107.