Flatfoot / Cavus Measurements (Meary / Calcaneal Pitch / Talonavicular Coverage) — free guideline decision tool
Weight-bearing lateral Meary angle and calcaneal pitch, AP talonavicular coverage angle: flatfoot (and severity) vs cavus. Includes how to measure and what each value means. Instant, browser-side.
Open guideline tool →Guideline-based
Implements the decision logic from published clinical guidelines.
Runs in your browser
No installation. Enter the patient's values and get a guideline recommendation instantly.
Data stays local
Nothing is uploaded. Results are for licensed clinicians only.
Worked calculation
The values below come from this tool's own example placeholders and are computed server-side with the formula shown on this page, so the arithmetic can be checked quickly. It demonstrates how to substitute values only — it is not clinical advice and not a real case.
| Meary angle (plantar apex positive) | 12 ° |
|---|---|
| Calcaneal pitch | 16 ° |
| Talonavicular coverage angle (AP) | 20 ° |
→Calcaneal pitch16°
- Meary angle (plantar apex positive)：12 ° → 4–15°: mild flatfoot
- Calcaneal pitch：16 ° → < 18°: low arch (flatfoot)
- Talonavicular coverage angle (AP)：20 ° → > 7°: forefoot abduction, uncovered talar head (progressive collapsing foot)
Common questions
What is Flatfoot / Cavus Measurements (Meary / Calcaneal Pitch / Talonavicular Coverage)?
Weight-bearing lateral Meary angle and calcaneal pitch, AP talonavicular coverage angle: flatfoot (and severity) vs cavus. Includes how to measure and what each value means. Instant, browser-side.
How is Flatfoot / Cavus Measurements (Meary / Calcaneal Pitch / Talonavicular Coverage) calculated? What is the core formula?
Meary angle (plantar apex positive) < −4° (dorsal apex): pes cavus Meary angle (plantar apex positive) −4–4°: normal Meary angle (plantar apex positive) 4–15°: mild flatfoot Meary angle (plantar apex positive) 15–30°: moderate flatfoot Meary angle (plantar apex positive) > 30°: severe flatfoot Calcaneal pitch < 18°: low arch (flatfoot) Calcaneal pitch 18–30°: normal Calcaneal pitch > 30°: pes cavus Talonavicular coverage angle (AP) ≤ 7°: normal Talonavicular coverage angle (AP) > 7°: forefoot abduction, uncovered talar head (progressive collapsing foot)
When is Flatfoot / Cavus Measurements (Meary / Calcaneal Pitch / Talonavicular Coverage) used?
Foot & ankle imaging: weight-bearing foot and lateral calcaneal views — hallux valgus, flatfoot and calcaneal fracture assessment.
What are the key clinical points for Flatfoot / Cavus Measurements (Meary / Calcaneal Pitch / Talonavicular Coverage)?
Weight-bearing lateral: Meary angle between the talar and first metatarsal axes — plantar apex (flatfoot) positive, dorsal apex (cavus) negative; calcaneal pitch between the inferior calcaneal tangent and the floor. Each value is graded against published reference ranges. Measurement technique and positioning change the numbers — compare like with like on follow-up. Part of the YuanDoctor MSK measurement topic.
What are the limits and cautions when using Flatfoot / Cavus Measurements (Meary / Calcaneal Pitch / Talonavicular Coverage)?
For licensed clinicians and clinical researchers. Interpret results with history, investigations and local protocols; not a diagnosis or prescription, and not a substitute for multidisciplinary decision-making or local guidelines.
Does Flatfoot / Cavus Measurements (Meary / Calcaneal Pitch / Talonavicular Coverage) upload patient data? Where is it calculated?
Calculation runs locally in the browser; inputs and results are not uploaded. For licensed clinicians only; interpret with history, investigations and local protocols — not a diagnosis or prescription.
How is Flatfoot / Cavus Measurements (Meary / Calcaneal Pitch / Talonavicular Coverage) calculated in practice? Can you show a worked example?
Inputs: Meary angle (plantar apex positive) 12 °, Calcaneal pitch 16 °, Talonavicular coverage angle (AP) 20 ° → Result: Calcaneal pitch 16 °（Meary angle (plantar apex positive): 12 ° → 4–15°: mild flatfoot, Calcaneal pitch: 16 ° → < 18°: low arch (flatfoot), Talonavicular coverage angle (AP): 20 ° → > 7°: forefoot abduction, uncovered talar head (progressive collapsing foot)）
Run Flatfoot / Cavus Measurements (Meary / Calcaneal Pitch / Talonavicular Coverage) now
Weight-bearing lateral Meary angle and calcaneal pitch, AP talonavicular coverage angle: flatfoot (and severity) vs cavus. Includes how to measure and what each value means. Instant, browser-side.
Open guideline tool →For licensed clinicians. Not a substitute for clinical judgement.
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