What is the appropriate treatment for a 16-year-old with a middle finger injury causing persistent swelling, intermittent mild numbness, and limited range of motion of the proximal interphalangeal (PIP) joint one week after a weight‑lifting plate fell on the finger?

Immediate Management: Obtain 3-View Radiographs and Refer to Hand Specialist Within 1 Week

This 16-year-old requires immediate 3-view radiographs of the affected finger (PA, lateral, and oblique views) to rule out occult fracture, intra-articular involvement, or ligamentous injury with bony avulsion, followed by referral to a hand specialist within one week regardless of radiographic findings. 1, 2

Initial Diagnostic Workup

Radiographic Imaging

• Standard 3-view examination is mandatory for phalangeal injuries involving the PIP joint 1
  • Posteroanterior (PA) view
  • True lateral view (critical for detecting joint subluxation or articular involvement)
  • Oblique view (internally rotated oblique increases diagnostic yield for phalangeal fractures) 1
• Two views are inadequate for detecting fractures in finger joints 1

Clinical Red Flags Present in This Case

The combination of persistent swelling at 1 week, intermittent numbness, and limited ROM suggests:

• Possible occult fracture (radiographically invisible initially)
• Intra-articular injury
• Collateral ligament injury
• Volar plate injury
• Potential nerve contusion or compression from swelling

Treatment Algorithm Based on Radiographic Findings

If Radiographs Show Fracture or Dislocation

• Refer immediately to hand specialist for definitive management 2
• Intra-articular fractures require specialist evaluation 3
• Fractures involving >1/3 of articular surface typically require operative fixation 1

If Radiographs Are Negative or Equivocal

Do NOT simply reassure and discharge. The persistent symptoms at 1 week post-injury warrant further action:

1. Immobilize in "intrinsic plus position" (MP joints flexed 70-90°, PIP/DIP joints in extension or slight flexion) 4

   • This prevents PIP joint contracture, which is the most common complication
   • Avoid prolonged immobilization beyond 3 weeks 4

2. Consider advanced imaging if symptoms persist:

   • MRI without contrast is ideal for evaluating ligamentous injuries (collateral ligaments, volar plate), capsular injuries, and occult fractures 1
   • MRI can detect injuries missed on radiographs and changes management in up to 66% of cases 1
   • CT is less useful for soft tissue injuries but can detect occult fractures 1

3. Mandatory hand specialist referral within 1 week 2

   • PIP joint injuries are commonly underestimated in severity 3, 5
   • Delayed or inadequate treatment leads to chronic stiffness, contracture, and prolonged disability 3, 6, 5

Critical Pitfalls to Avoid

The "Jammed Finger" Trap

Never dismiss PIP joint injuries as simple "jammed fingers." These injuries carry high disability risk and are frequently undertreated 5, 4. The fact that symptoms persist at 1 week is concerning and suggests significant injury.

Prolonged Immobilization

• Immobilization beyond 3 weeks causes extensor and flexor contractures 4
• Early mobilization (after 3 weeks maximum) is essential for optimal outcomes
• However, premature mobilization of unstable injuries worsens outcomes

Delayed Diagnosis

• Injuries presenting >2 weeks after trauma may develop soft tissue fibrosis and capsular contracture 7
• This significantly complicates treatment and may necessitate open reduction
• Your patient is at 1 week—still within the window for optimal intervention

Immediate Management Steps

1. Order 3-view radiographs today (PA, lateral, oblique) 1

2. Examine for joint stability:

   • Check for lateral laxity (collateral ligament injury)
   • Assess for volar plate integrity
   • Document active and passive ROM
   • Evaluate neurovascular status (the intermittent numbness needs assessment)

3. Immobilize appropriately:

   • Buddy tape to adjacent finger if stable injury suspected
   • Aluminum foam splint in intrinsic plus position if unstable
   • Maximum 3 weeks immobilization 4

4. Refer to hand specialist within 1 week regardless of radiographic findings 2

   • Persistent swelling and limited ROM at 1 week post-injury warrant specialist evaluation
   • Specialist can determine need for MRI and guide rehabilitation

5. Educate patient:

   • Pain and swelling can persist up to 1 year even with appropriate treatment 3
   • Emphasize importance of follow-up to prevent chronic stiffness
   • Avoid re-injury during healing

Why This Approach Prioritizes Outcomes

Morbidity prevention: PIP joint contractures are functionally devastating and significantly reduce hand function 4. Early specialist involvement and appropriate immobilization prevent this.

Quality of life: Chronic PIP joint stiffness, pain, and deformity are common complications of inadequate initial treatment 3, 6, 5. The 1-week window allows intervention before fibrosis sets in.

Avoiding delayed complications: The intermittent numbness suggests possible nerve involvement or compartment issues that require monitoring. Persistent swelling at 1 week is abnormal and suggests significant soft tissue or articular injury requiring specialist assessment.