What is the likely cause and recommended management of new loss of sensation over the proximal palm two weeks after distal radius fracture open reduction internal fixation?

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Last updated: October 20, 2026 • View editorial policy

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Median Nerve Injury from Hardware Malposition

This patient most likely has median nerve compression or injury from surgical hardware, and requires urgent surgical exploration with hardware revision and possible nerve decompression or repair.

Most Likely Cause

New-onset insensate proximal palm two weeks post-ORIF strongly suggests median nerve injury, specifically affecting the palmar cutaneous branch or main trunk. The proximal palm sensory distribution is characteristic of median nerve territory. Given the delayed presentation (2 weeks post-op rather than immediate), this points to:

  • Hardware malposition with screw penetration or plate impingement on the median nerve
  • Volar plate prominence causing direct nerve compression
  • Less commonly, delayed hematoma or scar tissue formation

The timing is critical here—immediate post-operative deficits suggest direct surgical trauma 1, while delayed presentation (as in this case) more commonly indicates progressive compression from hardware or evolving pathology.

Immediate Management Algorithm

Step 1: Clinical Assessment

Perform focused examination to determine:

  • Sensory distribution: Proximal palm suggests palmar cutaneous branch; include thumb/index/middle finger testing for main trunk involvement
  • Motor function: Test thenar muscles (thumb opposition, abduction) and FPL/FDP to index
  • Tinel's sign over carpal tunnel and surgical site
  • Two-point discrimination if cooperative

Step 2: Imaging

  • Obtain immediate radiographs (PA, lateral, oblique views) to assess:
    • Screw length and trajectory—look for volar cortex penetration
    • Plate position relative to watershed line
    • Any hardware backing out

Step 3: Surgical Decision

Proceed with urgent surgical exploration if:

  • Complete sensory loss in median nerve distribution
  • Any motor deficit present
  • Radiographs show hardware malposition or volar cortex breach
  • No improvement within 48-72 hours of observation

The threshold for exploration should be low—delayed intervention worsens outcomes for structural nerve injuries 1, 2.

Surgical Exploration Findings and Management

During exploration, expect to find:

  • Screw penetration of volar cortex compressing nerve
  • Plate prominence at watershed line
  • Direct nerve laceration (rare but reported) 1
  • Nerve entrapment in fracture site or scar tissue

Intraoperative management:

  • Remove or revise offending hardware
  • Perform carpal tunnel release if any question of compression
  • Directly visualize the median nerve—this is critical 1
  • If nerve transection found, perform primary repair or nerve grafting 2
  • If nerve in continuity but compressed, decompress and observe

Conservative Management (Only if Specific Criteria Met)

Consider observation only if:

  • Incomplete sensory deficit with no motor involvement
  • Normal hardware position on radiographs
  • Symptoms improving (not static or worsening)
  • Patient can be followed closely (48-72 hour intervals initially)

Even then, consider ultrasound evaluation of the median nerve to assess for structural injury or compression 3. MRI can be used but is less readily available and may be equivocal 4.

Critical Pitfalls to Avoid

  1. Delaying exploration: Waiting months for "nerve recovery" when hardware is malpositioned leads to permanent deficits 2
  2. Assuming neuropraxia: Post-operative nerve deficits after ORIF should be considered structural until proven otherwise
  3. Inadequate visualization: If exploring, must directly visualize the nerve—don't assume decompression is adequate without seeing it 1
  4. Missing associated injuries: Check for flexor tendon entrapment, which can occur concurrently 4

Expected Recovery Timeline

  • Neuropraxia: Recovery begins 4-6 weeks, complete by 12 weeks
  • Axonotmesis after decompression: 3-6 months for meaningful recovery 2
  • Nerve repair/grafting: 9-12 months for functional recovery 2

If no improvement by 4 months, re-exploration with nerve conduction studies is indicated 3.

Key Point on Quality of Life

Permanent median nerve deficit severely impacts hand function and quality of life—loss of thumb opposition and palmar sensation is functionally devastating. Early aggressive management is justified to prevent permanent disability, even if it means revision surgery in the early post-operative period.

References

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