Joint inflammation caused by syphilis infection spreading to the joints.
Because syphilitic arthritis is rated by analogy to another musculoskeletal code, the evidence that helps most is evidence that precisely describes the condition of each affected joint. Imaging such as X-rays or MRI reports, range-of-motion measurements from a physical examination, and orthopedic or rheumatology records documenting joint damage, ankylosis, or instability all speak directly to the rating criteria. If a joint has been surgically replaced, operative reports, hospital discharge records, and follow-up notes confirming the date of implantation and whether all original components were replaced are relevant to how and when prosthetic replacement ratings apply. If you use crutches permanently as a result of the joint condition, medical records or statements establishing that permanent use are relevant to special monthly compensation. Statements from you or people who know you describing how joint problems affect your ability to work, walk, grip, or carry out daily tasks can also help show the full extent of your functional loss.
Conditions that are often caused or made worse by this one. If you have any of these, they may be claimable as secondary service connection.