Plantar fasciitis is one of the most common foot complaints seen in clinical practice. Most cases resolve with conservative care, but the path to resolution is slower than patients expect, and the evidence on what actually works has shifted in the past decade.
What the Evidence Now Supports
The older approach to plantar fasciitis leaned heavily on stretching: plantar fascia stretches, Achilles stretches, ice, and rest. These remain reasonable adjuncts, but they are not the primary driver of recovery.
The more current evidence points to high-load strength training as the most effective conservative intervention. A 2015 RCT by Rathleff et al. compared high-load progressive strength training (unilateral heel raises with a towel under the toes) against a plantar fascia-specific stretching protocol, both with shoe inserts. At the primary endpoint of three months, the strength group showed a 29-point lower Foot Function Index score (p=0.016). At six and twelve months, both groups converged with no significant difference between them. The practical implication is that loading gets patients to recovery faster, not necessarily to a better ultimate outcome.
The mechanism likely explains the early advantage: load stimulates tissue adaptation, and the fascia responds to progressive mechanical stress in ways that stretching alone does not drive. Whether that translates to a better long-term outcome is less clear from the current trial data — both groups eventually recovered — but loading appears to accelerate the process.
Practical Protocol
The core exercise is the single-leg heel raise with towel curls or a step, progressing to a weighted single-leg heel raise. The protocol typically looks like this:
- 3 sets of 12 reps, slow tempo (3 seconds up, 3 seconds down)
- Performed on a step with heel drop for full range
- Weighted via backpack once bodyweight becomes easy
- Frequency: daily or every other day, not just 2x/week
Isometric holds (sustained plantarflexion against resistance or bodyweight) are useful in early stages when pain is high. Isometrics reduce pain in the short term and allow loading to begin before the patient can tolerate full dynamic range work.
Stretching is still worth including, particularly calf and plantar fascia-specific stretching first thing in the morning before weight-bearing. The first step pain that characterizes plantar fasciitis is partly related to fascial stiffness after rest. Morning stretching and stepping on a tennis ball or frozen water bottle are low-cost adjuncts, but they should supplement loading, not replace it.
Orthotics: What the Evidence Actually Says
Prefabricated insoles and custom orthotics are widely used for plantar fasciitis. The evidence is more modest than their popularity suggests.
A 2018 systematic review and meta-analysis in the British Journal of Sports Medicine (Whittaker et al., 19 RCTs, 1,660 participants) found moderate-quality evidence that foot orthoses reduce pain in the medium term (seven to twelve weeks) compared to sham orthotics. There was no short-term benefit and no clinically meaningful difference at longer follow-up. Custom orthoses performed no differently from prefabricated insoles at any time point.
Orthotic use is reasonable as a short-term pain management adjunct, particularly for patients with high pronation or significant biomechanical loading challenges. Recommending expensive custom orthotics as a primary treatment is not well-supported by the evidence. If prescribed, they work best alongside a loading protocol, not instead of one.
Footwear modification is underrated. Transitioning patients away from completely flat, unsupported footwear and toward shoes with moderate heel-to-toe drop reduces fascial strain at load acceptance and is often easier to implement than a full orthotic prescription.
When Imaging Is Warranted
Routine imaging is not indicated for typical plantar fasciitis. The diagnosis is clinical: heel pain with the classic pattern of first-step morning pain, tenderness at the medial calcaneal tuberosity, and reproduction with passive dorsiflexion of the toes (the windlass test).
Imaging is appropriate when:
- Pain has not improved after 3-6 months of consistent conservative management
- The presentation is atypical (e.g., pain distributed across the heel rather than localized to the medial tuberosity)
- You are ruling out calcaneal stress fracture in a high-volume athlete or military recruit
- Night pain or non-mechanical pain pattern suggests a systemic cause
Ultrasound is the first-line imaging choice for soft tissue assessment. Fascia thickness greater than 4 mm and hypoechoic signal changes support the diagnosis, but imaging findings do not correlate strongly with symptom severity. A normal ultrasound does not rule out plantar fasciitis.
X-ray can identify a calcaneal heel spur, but the spur itself is not the cause of pain and does not change management. Many asymptomatic adults have calcaneal spurs. Avoid making the spur the focus of clinical communication.
When to Refer
Most patients with plantar fasciitis should not need surgical or procedural intervention. Refer when:
- Conservative management has been consistently applied for 6-12 months without meaningful improvement
- Pain is significantly limiting function or work despite adherence to the protocol
- Shockwave therapy is being considered as a next-line option (requires a provider with appropriate equipment and training)
Platelet-rich plasma (PRP) injections show some promise in the literature for recalcitrant cases, but the evidence quality is moderate and protocols vary. Corticosteroid injection provides short-term pain relief but may weaken the fascia with repeated use and has not shown durable long-term benefit.
Clinical Takeaway
Plantar fasciitis responds well to conservative care, but the timeline is 3-6 months, not weeks. Patients who understand this from the start are more likely to stay with the protocol.
The most effective conservative approach combines progressive heel-raise loading, footwear guidance, and targeted morning stretching. Orthotics are a reasonable adjunct for the first few months. Imaging is rarely needed upfront. The majority of patients who complete a structured loading program will recover without procedural intervention.
References
- Rathleff MS, Mølgaard CM, Fredberg U, et al. High-load strength training improves outcome in patients with plantar fasciitis: a randomized controlled trial with 12-month follow-up. Scand J Med Sci Sports. 2015;25(3):e292–300. PMID: 25145882
- Whittaker GA, Munteanu SE, Menz HB, et al. Foot orthoses for plantar heel pain: a systematic review and meta-analysis. Br J Sports Med. 2018;52(5):322–328. PMID: 28935689