Treatment for Torn Finger Extensor Ligament in 76-Year-Old Male
For a 76-year-old male with inability to fully extend the right middle finger due to a torn ligament, obtain radiographs immediately to rule out bony avulsion (mallet finger), and if the injury involves >1/3 of the articular surface, palmar displacement, or >3mm fragment gap, refer for surgical fixation; otherwise, treat with extension splinting of the distal interphalangeal joint.
Initial Diagnostic Approach
The inability to fully extend a finger following ligamentous injury most commonly represents either:
- Mallet finger (extensor tendon/ligament disruption at the DIP joint)
- Central slip injury (leading to boutonniere deformity at the PIP joint)
- Collateral ligament injury at the MCP joint
Immediate Imaging Required
Obtain 3-view radiographs of the affected finger (PA, lateral, and oblique) 1. This is critical because:
- Large bony avulsion fragments require different management than pure soft tissue injuries
- Radiographs detect osseous "mallet" injuries where bone involvement dictates surgical versus conservative treatment 1
- The presence of fracture fragments helps determine if open reduction and internal fixation is needed 1
Treatment Algorithm Based on Injury Pattern
If Mallet Finger (DIP Joint Extension Loss)
Surgical indications 1:
- Bony avulsion involving >1/3 of the articular surface
- Palmar displacement of the distal phalanx
- Interfragmentary gap >3mm
Conservative treatment for injuries not meeting surgical criteria:
- Continuous DIP joint extension splinting for 6-8 weeks
- Keep PIP joint mobile to prevent stiffness
If Central Slip Injury (Boutonniere Deformity)
At 76 years old, if this is an acute injury (within 2-3 weeks):
- Extension splinting of the PIP joint
- Early mobilization protocols after initial immobilization
If chronic (>6 weeks), surgical reconstruction may be necessary. A 2024 case report 2 demonstrated excellent outcomes using flexor digitorum superficialis tendon reconstruction in a 65-year-old with 6-month-old injury, achieving normal ROM within 2 months and DASH score improvement from 50 to 4.2.
If Collateral Ligament Injury (MCP Joint)
Surgical fixation is indicated even in delayed presentations 3. A 2019 study of 46 patients showed:
- All achieved stable joints with complete pain resolution
- Mean grip strength recovered to 88.52% of opposite hand
- Mean DASH score of 9.56/100 (excellent function)
- Surgery remained effective even with prolonged time from injury 3
Key Clinical Pitfalls
Do not assume the injury location based solely on symptoms 4. A 2025 case report highlighted how a zone 3 flexor tendon rupture masqueraded as a distal avulsion, requiring proximal exploration. Similarly, extension deficits can have multiple anatomical causes.
Age considerations: At 76, this patient may have:
- Reduced tissue quality affecting healing
- Comorbidities affecting surgical candidacy
- Different functional demands than younger patients
However, age alone should not preclude surgical intervention when indicated, as the 2019 collateral ligament study 3 and 2024 boutonniere case 2 both showed excellent outcomes in patients 65+ years old.
Referral Indications
Immediate hand surgery referral if 1, 5:
- Radiographs show bony avulsion meeting surgical criteria
- Complete inability to extend suggests complete tendon/ligament disruption
- Joint instability on examination
- Injury >2-3 weeks old with persistent dysfunction
Conservative management may be attempted under close follow-up if:
- No bony involvement or minimal avulsion
- Partial tendon injury with some active extension preserved
- Patient medically unfit for surgery
The evidence strongly supports that proper initial diagnosis and timely intervention—whether surgical or conservative—prevents chronic deformity and functional impairment 5, 6. Given the patient's age and the functional importance of the middle finger, err toward specialist evaluation to optimize long-term outcomes.