Tendon Injuries
A 32-year-old carpenter presents with a laceration over the dorsum of his left middle finger at the level of the proximal interphalangeal joint. He is unable to extend the PIP joint and there is a visible gap in the extensor mechanism. The wound was sustained 8 hours ago while handling sheet metal. Regarding extensor tendon injuries:
Mark each as TRUE or FALSE
Extensor tendons are divided into zones: Zone I (DIP joint), Zone II (middle phalanx), Zone III (PIP...
Zone I injuries (terminal tendon at DIP) cause mallet finger - loss of active DIP extension with int...
Even zones are over joints; Zone I is at the MCP joint; mallet finger causes inability to flex the D...
Zone III injuries (central slip at PIP) lead to boutonniere deformity if untreated: PIP flexion (los...
Zone V injuries (over MCP) may involve the sagittal band which stabilizes the extensor tendon centra...
Answer the questions to see explanations
Click T (True) or F (False) for each option