Module 2: Anatomy & Physiology of the Foot
Module 2 of 10 · Lesson 4 of 4
Module 2 · Lesson 4
Hands-On Foot Anatomy Assessment
Learning Objectives
By the end of this lesson, the learner will be able to:
- Demonstrate the technique for palpating the dorsalis pedis and posterior tibial pulses and grading pulse strength on the standard 0–3+ scale.
- Perform a 10g monofilament sensory examination at the standard test sites and interpret the results.
- Use a 128 Hz tuning fork and reflex hammer to assess vibration sense and the Achilles reflex.
- Identify three foot arch types using the wet footprint test and recognize the clinical implications of each.
This lesson translates the anatomy you've learned into the bedside skills that make foot care nursing effective: pulse palpation, sensory testing, reflex assessment, and arch evaluation. Each technique is straightforward — but doing it the same way every time, on every patient, is what produces reliable findings and defensible documentation.
🩸 Circulatory Skill
Palpating Foot Pulses
Objective: Detect circulatory compromise — particularly peripheral artery disease — through systematic pulse palpation.
Equipment
Your fingers (manual palpation)
Handheld Doppler (if pulses are weak or absent)
1
Locate the dorsalis pedis pulse
On the dorsum (top) of the foot, place your fingers in the groove between the first and second metatarsals, lateral to the extensor hallucis longus tendon. Apply gentle pressure — pressing too hard can occlude the artery and erase the pulse.
2
Locate the posterior tibial pulse
Place your fingers behind the medial malleolus (the bony bump on the inside of the ankle), in the groove between the malleolus and the Achilles tendon.
3
Grade the pulse
Use the 0 to 3+ scale below. Compare bilaterally — a unilateral difference is as important as an overall reduction.
4
Document and act on findings
Record the grade for each pulse on each foot. Diminished or absent pulses warrant further evaluation, including an Ankle-Brachial Index (ABI) when indicated.
Pulse Grading Scale (0 to 3+)
0
Absent
No pulse palpable
Severe peripheral artery disease or arterial occlusion — escalate
1+
Diminished
Weak, thready, hard to find
Possible arterial insufficiency — consider ABI
2+
Normal
Easily palpable, expected strength
Normal finding
3+
Bounding
Strong, full pulse
Often seen in younger, fit patients; can also reflect hyperdynamic states
Clinical Pearl
Approximately 8% of healthy adults have a congenitally absent dorsalis pedis pulse. Always palpate the posterior tibial as well, and consider Doppler before concluding a foot is ischemic.
Clinical Relevance
- Absent or diminished pulses suggest peripheral artery disease and warrant vascular evaluation.
- Cool, pale feet — particularly with pallor on elevation or dependent rubor — point toward poor perfusion and elevated wound risk.
- Bilateral and unilateral differences both matter: document each pulse on each foot separately.
⚡ Sensory Skill
10g Monofilament Sensory Test
Objective: Identify loss of protective sensation — the strongest single predictor of diabetic foot ulceration.
Equipment
10g (5.07) Semmes-Weinstein monofilament
1
Demonstrate first
Show the patient how the filament feels by touching it to their forearm. Then ask them to close their eyes during the actual test so they cannot anticipate where you will touch.
2
Apply correctly
Touch the filament perpendicular to the skin. Press until the filament bends into a C-shape, hold for 1–2 seconds, then release. Ask the patient to say "yes" each time they feel it.
3
Test the standard sites
Test 9 sites on each foot (see interactive diagram below). Skip any callused area — calluses dampen the stimulus and produce a false negative.
4
Interpret and document
Loss of sensation at any site is clinically significant and is documented as loss of protective sensation. Greater numbers of insensate sites correlate with higher ulcer risk.
Interactive: Mark the 9 Test Sites
The standard examination tests 9 sites on each foot — 8 plantar and 1 dorsal. Tap each point as you would test it on a patient.
9-Site Sensory Map
Sites 1–3: plantar surface of the great, 3rd, and 5th toes. Sites 4–6: the 1st, 3rd, and 5th metatarsal heads. Sites 7–8: the medial and lateral midfoot. Site 9: the heel.
Tap each point as you would test it on a patient.
0 of 9 sites tested
Key Takeaway
Loss of protective sensation at any site puts the patient in a higher-risk category. Document the specific sites that are insensate, intensify foot self-care education, and confirm the patient understands they cannot rely on pain to detect injuries.
⚡ Sensory & Motor Skill
Vibration Sense & Achilles Reflex
Objective: Detect early peripheral neuropathy. Vibration sense is often lost before light-touch sensation.
Equipment
128 Hz tuning fork
Reflex hammer
1
Tuning fork test
Strike the tuning fork to set it vibrating, then place its base on the dorsum of the great toe (over the interphalangeal joint). Ask the patient to say when the buzzing stops. Reduced or absent perception indicates large-fiber neuropathy.
2
Achilles reflex
Position the foot in slight dorsiflexion. Tap the Achilles tendon with the reflex hammer; a normal response is plantar flexion. A reduced or absent reflex bilaterally is consistent with peripheral neuropathy in the appropriate clinical context.
3
Compare bilaterally
Findings are most informative when compared side-to-side. A new asymmetric finding warrants further evaluation.
🦶 Biomechanical Skill
Identifying Foot Arch Type
Objective: Recognize flat (pes planus), normal, and high (pes cavus) arches. Arch type contributes to pain syndromes, injury risk, and footwear selection.
Equipment
Water and a piece of paper or dry surface
Treadmill or open hallway for gait observation
Wet Footprint Test
Have the patient lightly wet the sole of the foot, step onto a piece of paper or dry surface, and step off. The footprint will fall into one of three patterns:
Flat Foot
Pes planus
The entire sole touches the ground. The footprint shows no inward curve along the medial side. Common in childhood, may persist into adulthood.
Normal Arch
Mesocavus
A clear inward curve along the medial side; the midfoot is partially imprinted. Distributes pressure evenly across the foot.
High Arch
Pes cavus
Only the forefoot and heel imprint; the midfoot does not contact the ground. The foot is rigid and a poor shock absorber.
Gait Observation (Optional)
If a treadmill or open hallway is available, observe the patient walking from behind. Look for overpronation (the foot rolls excessively inward, often associated with flat feet) or supination / underpronation (the foot rolls outward, often associated with high arches). Both can contribute to lower-extremity pain syndromes and inform footwear recommendations.
Clinical Relevance
- Flat feet can contribute to medial arch pain, posterior tibial tendon dysfunction, and referred knee, hip, and back pain.
- High arches increase rigidity and reduce shock absorption, raising the risk of metatarsalgia, stress fractures, and lateral ankle sprains.
- Arch type informs footwear and orthotic recommendations — motion-control or stability shoes for flat feet; cushioned, flexible footwear for high arches.
Practice Checklist: A Complete Assessment
Use this checklist to walk through a structured foot assessment on a willing colleague or family member. Each item builds confidence with the techniques covered in this module.
✓ Hands-On Practice
Run through these 8 steps
Ready to check your understanding? Take the quick knowledge check for this lesson.
✓ End of Module 2
You've completed the Anatomy & Physiology module
Next up: Module 3 — Common Foot Conditions & Diseases.
Educational Disclaimer
The information on this website and any communication with RNscrub Foot Care is provided for educational and informational purposes only. It is not a substitute for medical advice, diagnosis, or treatment. Patients are always encouraged to consult with their primary care provider or appropriate specialist for individual clinical decisions.
References
- Boulton AJM, Armstrong DG, Albert SF, et al. Comprehensive Foot Examination and Risk Assessment. Diabetes Care. 2008;31(8):1679–1685.
- American Diabetes Association Professional Practice Committee. Standards of Care in Diabetes — 2024 (Section 12). Diabetes Care. 2024;47(Suppl 1).
- International Working Group on the Diabetic Foot (IWGDF). IWGDF Guidelines on the Prevention and Management of Diabetes-Related Foot Disease. 2023.
- Pop-Busui R, Boulton AJM, Feldman EL, et al. Diabetic Neuropathy: A Position Statement by the American Diabetes Association. Diabetes Care. 2017;40(1):136–154.
- Gerhard-Herman MD, Gornik HL, Barrett C, et al. 2016 AHA/ACC Guideline on the Management of Patients With Lower Extremity Peripheral Artery Disease. Circulation. 2017;135(12):e726–e779.
- Razeghi M, Batt ME. Foot type classification: a critical review of current methods. Gait & Posture. 2002;15(3):282–291.