An 83 year-old patient lives with his daughter. At his examination, the advanced practice registered nurse (APRN) notes numerous bruises and scars. The patient is making less eye contact than usual. The daughter is initiating all inquiries and responding to all questions. The patient usually engages in the conversation during regular office visits. These assessment findings are most concerning for which differential diagnosis?

Assessment of hip stability in newborns is an essential component of early musculoskeletal screening to detect developmental dysplasia of the hip (DDH). Early identification is critical because untreated hip instability can lead to gait abnormalities, joint deformity, and long-term disability. Specific orthopedic maneuvers are used during infancy to assess whether the femoral head is dislocatable or reducible within the acetabulum. These tests are routinely performed until the infant begins walking, after which other signs become more apparent.

Rationale:
A. The Barlow test is used to assess whether the infant’s hip is dislocatable. It involves gently adducting the hip and applying posterior pressure to determine if the femoral head can be pushed out of the acetabulum. A positive Barlow test indicates hip instability and suggests developmental dysplasia of the hip requiring further evaluation and monitoring.

B. The Trendelenburg test assesses hip abductor muscle strength in older children and adults, not newborns. It evaluates pelvic stability during single-leg stance and is used in conditions such as hip dysplasia, muscular weakness, or nerve injury. It is not appropriate for detecting neonatal hip instability.

C. The Ortolani test is used to assess whether a dislocated hip can be reduced back into the acetabulum. It involves abducting the infant’s hips while applying gentle anterior pressure to feel or hear a “clunk” as the femoral head relocates. A positive Ortolani sign indicates a reducible dislocation consistent with developmental dysplasia of the hip.

D. The Leopold maneuver is an obstetric assessment technique used during pregnancy to determine fetal position, presentation, and lie within the uterus. It is not related to neonatal orthopedic examination or detection of hip instability. Therefore, it is not used in assessing developmental dysplasia of the hip.

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.