Final answer:
Ulnar drift is common with Rheumatoid Arthritis (RA), a painful inflammatory condition affecting the joints and leading to deformities such as deviation of the fingers.
Step-by-step explanation:
Ulnar drift of the fingers is common with Rheumatoid Arthritis (RA). RA is a chronic autoimmune condition primarily affecting synovial joints, leading to painful swelling, stiffness, and joint deformation. It typically arises in individuals between 40 and 50 years old, more frequently in women. The inflammation of the joint capsule and synovium due to immune cells can result in cartilage breakdown, and ultimately, changes in the structure of the joints like ulnar drift, where fingers deviate to the outer side.
RA may also cause systemic issues such as lung fibrosis and coronary heart disease, lacking a cure but treated with medications to alleviate symptoms and maintain joint function.