Treatment of Zone 2 Fifth Metatarsal Base Fracture
A hard-soled shoe is appropriate and effective for treating a Zone 2 (Jones) fracture of the fifth metatarsal base, with outcomes comparable to casting and the advantage of faster return to activity.
Primary Recommendation
For a Zone 2 fifth metatarsal base fracture, use a hard-soled shoe with weight-bearing as tolerated 1. This approach is noninferior to short leg casting for pain control at 6 months and allows significantly faster return to preinjury activity (37 days vs 43 days with casting) 1.
Evidence-Based Treatment Algorithm
Conservative Management (First-Line)
Hard-soled shoe treatment:
- Weight-bearing as tolerated immediately
- Duration: 3-6 weeks of immobilization 2
- Expected union time: 7-8 weeks 3
- Return to activity: 8-10 weeks 3, 4
- Patient satisfaction: 89.5% 1
- Union rate: 100% in recent studies 1
Alternative Conservative Option
CAM-walker boot:
- Slightly faster radiographic healing (7.2 weeks vs 8.6 weeks) 3
- Similar functional outcomes to hard-soled shoe 3
- Similar return to activity time 3
- Consider if patient prefers more rigid immobilization
Key Clinical Considerations
When Conservative Treatment Works Best:
- Minimally displaced fractures
- Prepubertal or non-athletic patients 5
- Patients who prioritize avoiding surgery 4
- Zone 2 fractures without high-risk features
When to Consider Surgery:
- Adolescent athletes requiring rapid return to sport 5
- Fractures with displacement >2mm
- Delayed union after 12 weeks of conservative treatment
- High-level athletes with performance demands
Important Caveats
Nutritional optimization is critical: Ensure adequate vitamin D and calcium intake, as deficiencies are modifiable risk factors for delayed union and stress fractures 5. Address these before initiating treatment.
Zone 2 fractures have inherently slower healing due to watershed blood supply at the metaphyseal-diaphyseal junction. This is anatomically distinct from Zone 1 (avulsion) fractures, which heal more predictably 2, 6.
Monitor for complications: While rare with conservative treatment (10.8% complication rate), watch for nonunion, malunion, or refracture 4. Serial radiographs at 4,8, and 12 weeks are standard 3.
Practical Implementation
- Immediate treatment: Fit patient with hard-soled shoe, allow weight-bearing as tolerated
- Pain management: Expect VAS scores of 8-10mm at 6 months (essentially pain-free) 1
- Follow-up schedule: 4,8,12 weeks, then as needed 3
- Return to activity: Progressive weight-bearing based on pain tolerance; most patients return to full activity by 8-10 weeks 3, 4
The hard-soled shoe approach provides equivalent healing with better functional recovery compared to casting, making it the preferred conservative treatment for Zone 2 fifth metatarsal base fractures 1.