Which condition is characterized by flexion at the PIP joint and extension at the DIP joint?

• A. Boutenniere Deformity
• B. Swan-neck Deformity
• C. Dupuytren's Contracture
• D. Trigger Finger

Answer: (A)

The condition characterized by flexion at the proximal interphalangeal (PIP) joint and extension at the distal interphalangeal (DIP) joint is known as Boutonnière deformity. This condition typically arises from damage to the central slip of the extensor tendon that normally straightens the finger at the PIP joint. Without proper function of this tendon, the PIP joint becomes flexed while the DIP joint may remain extended or hyperextended, resulting in the characteristic appearance of this deformity.

The mechanism of this deformity often involves trauma or conditions that compromise tendon integrity. Understanding Boutonnière deformity is critical in occupational therapy practice as it directly impacts hand function, requiring specific therapeutic interventions to restore mobility and strength in affected fingers. Recognizing the deformity's distinctive positional characteristics helps in assessing hand injuries and planning appropriate treatments for rehabilitation.