The advanced practice registered nurse (APRN) assesses a 75 year-old patient in the primary care office. The patient presents with concerns of bilateral tender, stiff wrists associated with metacarpophalangeal (MCP) and distal interphalangeal (DIP) joint pain. They report associated stiffness that is worse in the morning for about an hour or more and after periods of Inactivity. On physical exam the APRN notes tender, warm, non-erythematous joints. What is the most likely cause of the patient's joint pain?

Joint disorders in older adults can present with overlapping symptoms, but careful assessment of pattern, duration of stiffness, and joints involved helps differentiate inflammatory from degenerative conditions. Rheumatoid arthritis is a chronic systemic autoimmune disease that primarily affects synovial joints, leading to inflammation, pain, and progressive joint damage. It typically presents with symmetrical joint involvement, prolonged morning stiffness, and signs of active inflammation such as warmth and tenderness. Identifying these features is essential for early diagnosis and disease-modifying treatment. Rationale: A. Rheumatoid arthritis is the most likely cause because it presents with symmetrical joint involvement, prolonged morning stiffness lasting more than one hour, and inflammation of small joints such as the MCP and wrists. The presence of tender, warm joints indicates active synovitis due to autoimmune-mediated destruction of the synovial membrane. Although DIP joints are less commonly affected, the overall pattern of inflammatory, bilateral joint pain strongly supports RA. B. Osteoarthritis typically involves degenerative changes in weight-bearing joints and commonly affects the DIP joints, but it is not associated with prolonged morning stiffness or significant warmth. Stiffness in OA is usually brief, lasting less than 30 minutes, and improves with activity. The presence of inflammatory signs such as warmth and prolonged stiffness makes OA less likely in this case. C. Gouty arthritis usually presents as acute, episodic attacks of severe pain, often affecting a single joint such as the first metatarsophalangeal joint. It is characterized by redness, intense pain, and swelling rather than chronic bilateral involvement of wrists and MCP joints. The chronic, symmetrical pattern described in this patient is not typical of gout. D. Trigger finger is a localized tendon disorder caused by stenosing tenosynovitis of the flexor tendon sheath, leading to locking or catching of a finger during movement. It does not cause systemic joint inflammation or symmetrical polyarticular pain. The presentation in this case involves multiple joints with inflammatory signs, making trigger finger an unlikely explanation.