What is true about Boutonnière deformity in RA? a) Can be associated with MCP, PIP, and DIP pathology b) Can be corrected with a fusion of the DIP joint (False, doesn't correct PIP) c). Can be corrected with a tenotomy of the lateral bands (False, terminal tendon tenotomy) d) Caused by dorsal subluxation of the lateral cords (False, lateral cords not involved - cords in DuPuytren's)

Boutonnière deformity in RA can be associated with MCP, PIP, and DIP pathology. It is not correctable with a fusion of the DIP joint or a tenotomy of the lateral bands, and is not caused by dorsal subluxation of the lateral cords.

Explanation:

Boutonnière deformity, in the context of Rheumatoid Arthritis (RA), involves various pathologies. It can be associated with MCP (Metacarpophalangeal), PIP (Proximal Interphalangeal), and DIP (Distal Interphalangeal) pathology. Secondly, while the affliction might be assumed to be corrected with a fusion of the DIP joint, this is not in fact the case because it doesn't rectify PIP issues. Similarly, performing a tenotomy on the lateral bands also does not address the root cause of the problem. This is because the issue is fundamentally associated with the terminal tendon, not the lateral bands. Lastly, despite potential assumptions to the contrary, Boutonnière deformity in RA is not caused by dorsal subluxation of the lateral cords. Albeit Dorsal cords are typically involved in Dupuytren's disease, in the case of RA, lateral cords don't play a significant role.

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