In an 80-year-old woman with a patellar fracture after a fall, what is the appropriate treatment and does she need to be non-weight-bearing?

Treatment of Patellar Fracture in an 80-Year-Old Woman

For an 80-year-old woman with a patellar fracture from a fall, surgical fixation is indicated if the fracture is displaced >3mm, has articular step-off >2mm, or disrupts the extensor mechanism (inability to actively extend the knee), and she should be allowed immediate weight-bearing as tolerated in an extension splint, not non-weight-bearing 1, 2.

Initial Assessment

First, determine if surgery is needed by checking three critical factors:

• Can she actively extend her knee against gravity? If no, the extensor mechanism is disrupted → surgery required
• Is the fracture displaced >3mm or articular step-off >2mm on radiographs? If yes → surgery required
• Is the fracture stable and non-displaced with intact extension? If yes → conservative treatment acceptable

In elderly patients, 85% have disrupted extensor mechanisms requiring surgery, and 66% present with comminuted fractures 3. The mechanism in 82% of elderly patients is a simple fall causing direct impact 3.

Surgical Treatment (If Indicated)

For an 80-year-old, modified cerclage wiring or locking plate fixation are preferred over traditional tension band wiring, as elderly patients have compromised bone quality and comminuted fracture patterns 4, 5:

• Comminuted fractures (most common in elderly): Modified cerclage wire or locking plate fixation 4, 5
• Simple transverse fractures: Tension band wiring with K-wires or cannulated screws 4
• Complex multifragmentary: Locking plate fixation (fewer complications than tension band) 4

Modified cerclage wiring in elderly patients achieves 94% excellent results with fracture union in 2.9 months and no significant complications 5. Surgical treatment yields significantly better functional outcomes than conservative management in elderly patients (P<0.05) 3.

Weight-Bearing Status: NOT Non-Weight-Bearing

Immediate weight-bearing is superior to delayed weight-bearing after surgical fixation 1. This is critical evidence from 2025:

• Immediate weight-bearing (Day 0 post-op) achieved:
  • Faster union: 8.4 weeks vs 13.7 weeks (p=0.01)
  • Less loss of reduction: 0% vs 30% (p=0.03)
  • Greater knee ROM: 120.5° vs 101.3° (p=0.02)
  • Earlier knee flexion initiation: 6.0 vs 7.2 weeks (p<0.001)
  • No increase in complications 1

Specific Protocol:

• Full weight-bearing as tolerated in an extension splint from Day 0
• Gradual passive mobilization:
  • Weeks 1-2: up to 30° flexion
  • Weeks 3-4: up to 60° flexion
  • Weeks 5-6: up to 90° flexion
  • Then progress to unlimited flexion and active mobilization 4

Conservative Treatment (If Non-Displaced)

Only for stable, non-displaced fractures with intact extensor mechanism:

• Extension splint or brace
• Weight-bearing as tolerated
• Gradual mobilization protocol as above

However, note that conservative treatment in elderly patients results in 30% developing extension lag of 10-30° compared to 9% with surgery (P<0.05) 3.

Critical Pitfall

Do not default to non-weight-bearing protocols in elderly patients - this outdated approach delays union, increases loss of reduction, worsens knee ROM, and promotes complications like muscle atrophy and joint stiffness without any safety benefit 1. The traditional concern about hardware failure is not supported by recent evidence when appropriate fixation techniques are used.

Expected Outcomes

With appropriate surgical treatment and immediate weight-bearing, 82% of elderly patients achieve their pre-fracture independence and mobility status 3. Union typically occurs within 3 months, with excellent or good results in 94% of cases 5.