Osteophyte vs. Erosion on MSK Ultrasound

What is the difference in the appearance of osteophytes versus the appearance of bone erosions on MSK ultrasound?
Osteophytes are bony proliferations at the #joints that appear as bony overgrowths outward from bone surfaces. These are caused by #degenerative joint diseases like osteoarthritis. This disease process also causes #cartilage loss.
Erosions are areas of bone loss that appear to indent the surface of the #bone. These are caused by #inflammatory conditions such as #rheumatoid and #psoriatic arthritis, or juvenile idiopathic arthritis (JIA) in children. Inflammatory #arthritis also causes synovial hypertrophy which can lead to damage of the cartilage and may have #tendon sheath involvement.

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