Flexion of PIP joint with hyperextension of DIP joint. Caused by central slip rupture of extensor tendon at PIP. Mechanism: forceful blow, RA, laceration. Clinical: inability to extend PIP; DIP hyperextends via lateral bands. Treatment: splinting PIP in extension 6 weeks; surgery for chronic cases.
What is the primary cause of Boutonnière deformity in a patient with rheumatoid arthritis?
Which of the following is a characteristic clinical finding in Boutonnière deformity?
What is the initial management for a traumatic Boutonnière deformity?
What is the Elson test used for in the context of Boutonnière deformity?
In which stage of Nalebuff classification for rheumatoid Boutonnière is the PIP flexion contracture less than 40 degrees?
What surgical procedure is indicated for a severe Boutonnière deformity (Stage III) with fixed deformity?
What is the effect of the transverse retinacular ligament (TRL) in Boutonnière deformity?
What is the typical mechanism of injury leading to an acute traumatic Boutonnière deformity?
Which structure is primarily disrupted in a Boutonnière deformity?
Which joint exhibits hyperextension in Boutonnière deformity?
