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A 39-year-old construction worker presents to your clinic with a complaint of decreased ability to use his right hand at work. He sustained a crush injury to his hand 7 months ago and reports persistent swelling in the hand for 1-2 months after the injury. A new radiograph is shown in figure A. On physical exam, he can passively flex the proximal interphalangeal (PIP) joint when the metacarpophalangeal (MCP) joint is flexed but not when the MCP joint is extended. Based on this information, where is his stiffness most likely originating from?
PIP joint capsule
MCP joint capsule
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A 45-year-old carpenter complains of difficult gripping a hammer, which worsens with repeated use. On physical exam, he is able to passively flex the proximal interphalangeal (PIP) joint when the metacarpophalangeal (MCP) joint is flexed but not when the MCP joint is extended. What is the most likely explanation?
Central slip rupture