Of all the modifications a clinician makes to a digital cast before fabrication, metatarsal pad placement is the one with the smallest margin for error and the largest variance in clinical outcome. The pad either offloads the metatarsal heads or it makes the patient's pain worse. There's not much middle ground, and the difference is measured in millimeters, not inches. This post pulls together what the published research says about optimal met-pad placement, the common mistakes that show up in dispensing rooms, and how digital editing software changes the workflow.
What the pad is actually doing
A metatarsal pad is prescribed to redistribute plantar pressure away from the metatarsal heads, especially the second through fourth, where metatarsalgia and submetatarsal pain commonly localize. The pad sits proximal to the heads and provides a fulcrum that transfers load to the metatarsal shafts behind them.
That works when the pad is positioned correctly. When it's positioned under the heads instead of behind them, it does the opposite of what was prescribed: it concentrates pressure exactly where you wanted to relieve it. The patient comes back complaining the orthotic made things worse, and your remake rate ticks up.
What the research says about optimal placement
The clinical literature on met-pad placement has been refining the “ideal position” for at least two decades. A few findings worth knowing:
Hylton Menz, a researcher widely cited in pedorthic clinical literature, has reviewed the evidence on whether met pads should be placed proximal or distal to the metatarsal heads. The general consensus across the studies he summarizes is that the pad should sit just proximal to the head, with even small position changes meaningfully affecting pressure-relief outcomes.
A commonly cited clinical guideline places the apex of the metatarsal pad approximately 6–10 mm proximal to the metatarsal heads, just distal to the leading edge of the orthotic shell. Recent work on patients with hallux valgus has refined this further: in HV-specific cases, placement at approximately 76% of foot length produced measurable reduction in peak pressure at the central metatarsal region.
The precision matters more than most clinicians realize. Position differences as small as 4 mm have been shown to change the pad's effectiveness at reducing plantar pressure under the metatarsal heads. That's smaller than the typical palpation margin of error, the published literature suggests roughly a 5 mm uncertainty when palpating bony landmarks externally, even by a certified pedorthist.
Position differences as small as 4 mm change whether a met pad relieves pressure or concentrates it. Palpation alone has roughly 5 mm of uncertainty.
The implication: palpation isn't enough on its own
Read those two numbers together and the conclusion is uncomfortable but defensible: external palpation of the metatarsal heads alone has roughly the same margin of error as the precision required to place the pad effectively. That doesn't mean palpation is useless, it remains the standard of care, but it does mean that any system which adds a second confirmation step (digital cast review, pressure-mapping overlay, plantar-anatomy reference imaging) is doing real clinical work.
This is exactly where digital editing software earns its keep.
How digital cast review changes the workflow
In a traditional foam-impression workflow, the met-pad position decision happens at fabrication: the pedorthist or technician at the lab marks the position on the cast or the orthotic blank, mills it, and ships. The prescribing clinician sees the device for the first time when the patient is wearing it. By then, the position is committed.
In a digital workflow with cast-editing software, the position decision happens at review, before the EVA is cut. The digital cast displays the bony architecture (when captured by a contact-based scanner) or the soft-tissue contour (when captured by laser or photogrammetry). The pedorthist places the pad on the cast, confirms position relative to the metatarsal heads, and only then sends the file to the mill.
Amfit's Correct & Confirm software was built around this review step. Every digital cast that flows through Amfit's central-fab pipeline gets opened, reviewed, and confirmed by a credentialed pedorthist before milling, and met-pad placement is one of the specific things they confirm. Practices running their own Amfit system use the same software in-clinic.
Common placement mistakes
The recurring mistakes that show up in clinical practice:
- Pad too distal. Placed under the metatarsal heads instead of behind them. Result: pressure concentration where you intended relief. The most common single error.
- Pad too proximal. Pulled too far back, ineffective offloading. Less harmful than too-distal but the prescription is wasted.
- Same pad, different feet. Default pad placement applied symmetrically to both feet despite asymmetry in the patient's foot length, met-head row position, or pathology pattern (HV on one side, neuroma on the other).
- Wrong pad geometry for the indication. Generic teardrop pad applied where a met-bar, neuroma cushion, or rocker-style profile would have been the better intervention. Pad placement is necessary but not sufficient, pad geometry matters too.
- No re-check at follow-up. Patient comes back, pain isn't resolved, the practice replaces the orthotic instead of adjusting the pad position by 3–4 mm and re-milling. The digital cast file makes this adjustment trivial; the physical-mold workflow does not.
A defensible placement protocol
Pulling the literature together, a reasonable clinical protocol looks something like this:
- Capture the foot with a scanner that produces a digital cast you can review (pin-contact, laser, structured light, not just foam, since foam can't be edited digitally).
- Identify the metatarsal heads on the digital cast. With a bony-architecture-capturing scanner, the head positions are visible directly. With surface-capture scanners, palpation landmarks plus the cast contour are the inputs.
- Place the pad apex 6–10 mm proximal to the metatarsal head row (or 76% foot length for HV-specific cases).
- Verify pad geometry matches the indication: teardrop for general metatarsalgia, neuroma cushion for interdigital neuroma, met bar for diffuse forefoot offloading, rocker profile for advanced cases.
- Confirm in software before fabrication. If you're milling in-clinic, this is your final QC step. If you're sending to central fab, an Amfit pedorthist confirms it before milling on their end.
- Re-evaluate at 4–6 weeks. If pain persists, adjust pad position on the saved digital cast (typically 2–4 mm in the indicated direction) and re-mill. Don't start over.
Bottom line
Met-pad placement is one of the highest-leverage clinical decisions in custom orthotic prescription. The published evidence supports placement just proximal to the metatarsal heads, with millimeter-grade precision making the difference between effective offloading and pain concentration. Palpation alone introduces an uncertainty range that overlaps with the precision required. Digital cast review, whether performed by your in-house team or by a central-fab pedorthist, is the workflow step that closes the gap. The physics of forefoot offloading don't care how the orthotic was prescribed. They care where the pad ends up.
References
- Menz HB. Evidence-based use of metatarsal pads: proximal or distal? Summary of clinical evidence on met-pad positioning. hyltonbmenz.com · Lower Extremity Review feature
- Optimum position of metatarsal pad in metatarsalgia for pressure relief. Cited clinical guideline of 6–10 mm proximal placement; positional differences as small as 4 mm influence outcome. ResearchGate, Optimum Position of Metatarsal Pad
- Optimal placement of metatarsal pads for patients with hallux valgus based on plantar pressure measurement. Foot and Ankle Surgery, 2025. Placement at 76% foot length; ~5 mm palpation margin of error reported. ScienceDirect, HV met pad placement
- Comparison of the Forefoot Pressure-Relieving Effects of Foot Orthoses. PMC, 2022. PMC9424780