In an adult with plantar fasciitis who has tried stretching, activity modification, arch‑supportive footwear, and NSAIDs, is a corticosteroid injection or platelet‑rich plasma therapy the preferred treatment?

Platelet-Rich Plasma (PRP) is Superior to Corticosteroid Injection for Plantar Fasciitis

For an adult with plantar fasciitis who has failed conservative measures (stretching, activity modification, arch-supportive footwear, and NSAIDs), platelet-rich plasma injection is the preferred treatment over corticosteroid injection, providing superior long-term pain relief and functional improvement.

Evidence-Based Recommendation

While older guidelines 1, 2 recommend corticosteroid injections as part of the treatment algorithm for plantar fasciitis, these guidelines predate the robust evidence for PRP therapy. The most recent and highest-quality evidence demonstrates clear superiority of PRP over corticosteroids for medium- and long-term outcomes.

Key Supporting Evidence

The 2025 systematic review and meta-analysis 3 of 13 randomized controlled trials involving 901 patients found:

• Short-term (≤6 weeks): No significant difference between PRP and corticosteroids (P = 0.85)
• Medium-term (3-6 months): PRP showed significantly better VAS pain scores than corticosteroids (P < 0.00001)

Multiple 2024-2025 studies corroborate these findings:

• A 2024 RCT 4 demonstrated significantly greater improvements in both VAS and AOFAS scores with PRP at 1,3, and 6 months (p<0.05)
• A 2025 RCT 5 showed superior VAS scores with PRP at 2 weeks (5.53 vs 6.47, P<0.001), 4 weeks (4.70 vs 5.27, P=0.003), and 12 weeks (2.10 vs 2.77, P=0.002)
• A 2024 meta-analysis 6 of 21 RCTs (1,356 patients) found PRP superior to corticosteroids for both pain reduction (SMD: 1.08, P=0.04) and AOFAS scores (SMD: 3.31, P=0.0009)

Clinical Algorithm

When to Use PRP vs Corticosteroids:

Choose PRP when:

• Patient has failed 6-12 weeks of conservative therapy
• Goal is sustained pain relief beyond 3 months
• Patient can tolerate initial 2-4 weeks of potentially slower pain improvement
• Patient wants to avoid corticosteroid-related complications (tendon weakening, fat pad atrophy, plantar fascia rupture)

Consider corticosteroids only when:

• Immediate short-term pain relief is the priority (e.g., upcoming event within 2-4 weeks)
• PRP is unavailable or cost-prohibitive
• Patient understands this provides temporary relief and may require repeat treatment

Important Caveats

Corticosteroid Limitations

The older guidelines 2 appropriately warn that corticosteroids "may serve only to inhibit healing and reduce the tensile strength of the tissue, predisposing to spontaneous rupture." While effective for acute phase pain relief, they "do not tend to alter long-term outcomes" 2.

PRP Administration

• Use the peppering technique for optimal results 5
• Expect initial discomfort for 1-2 weeks post-injection
• Peak benefit occurs at 3-6 months 3, 4, 5

Comparative Effectiveness Hierarchy

A 2026 network meta-analysis 7 ranking all injection therapies found:

1. Botulinum toxin A (best short and long-term, but less commonly used)
2. PRP (second choice, most practical option)
3. Corticosteroids (effective short-term only)

Practical Implementation

Inject PRP as the first-line injection therapy after conservative measures fail at 6-12 weeks 8. Reserve corticosteroids only for situations requiring immediate short-term relief, with full patient counseling about limited durability and potential complications.

The evidence is unequivocal: PRP provides superior sustained pain relief and functional improvement compared to corticosteroids for chronic plantar fasciitis 3, 6, 4, 5.