lumbrical plus finger
Pronunciation: LUM-bri-kal
Paradoxical finger extension at interphalangeal joints during attempted grip due to abnormal lumbrical muscle action.
Full Definition
Lumbrical plus finger is a clinical phenomenon where attempted finger flexion results in extension of the interphalangeal joints due to excessive lumbrical muscle tension. This condition typically occurs after flexor digitorum profundus tendon injury or repair when the lumbrical muscle origin shifts proximally, creating mechanical disadvantage. During grip attempts, the lumbrical contracts but instead of assisting flexion, it extends the IP joints while the finger fails to contribute to grip strength. The condition is most common in the small finger and may require surgical intervention including lumbrical muscle release or tendon transfers to restore normal function.
Usage
Usage note: Describe the paradoxical movement pattern clearly in clinical documentation.
In Context
- "The patient developed lumbrical plus finger following flexor tendon repair in zone II." — Post-operative complication
- "Lumbrical release resolved the paradoxical extension seen in lumbrical plus finger." — Surgical intervention