A 55-year-old man with long-standing rheumatoid arthritis presents with difficulty extending the middle and ring fingers with a locked flexion posture of the proximal interphalangeal joints that he cannot actively correct. This deformity is known as:

• A Boutonniere deformity
• B Trigger finger (stenosing tenosynovitis) ✓
• C Mallet finger
• D Ulnar drift

Explanation

Trigger finger in RA results from flexor tenosynovitis causing nodular entrapment at the A1 pulley, leading to locking of the finger in flexion. The patient cannot actively extend the affected finger. Boutonniere deformity involves PIP flexion with DIP hyperextension due to central slip rupture. Mallet finger involves DIP flexion from extensor tendon disruption. Ulnar drift is a wrist/metacarpophalangeal deformity.

Reference: Campbell's Operative Orthopaedics, 14th ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.