AI Answers About Flat Feet: Model Comparison
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AI Answers About Flat Feet: Model Comparison
DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.
Flat feet (pes planus) is a condition in which the arch of the foot partially or completely collapses, causing the entire sole to contact the ground when standing. Approximately ~18-25% of the adult population is projected to have flat feet, making it one of the most common foot conditions. While many people with flat feet are entirely asymptomatic, others experience foot pain, ankle instability, knee pain, and difficulty with prolonged standing or walking. Adult-acquired flatfoot, typically caused by posterior tibial tendon dysfunction (PTTD), is a progressive condition that affects approximately ~5 million Americans and can lead to significant disability if untreated. The confusion between benign flexible flat feet and progressive PTTD drives many patients to search online for guidance.
The Question We Asked
“I’m a 50-year-old woman and I’ve always had somewhat flat feet, but over the past year, my right foot has become noticeably flatter than the left. I have pain along the inside of my ankle that gets worse with walking, and my right foot seems to turn outward more than it used to. I can’t stand on my tiptoes on the right foot without significant pain. My left foot is fine. Are flat feet something that can get worse with age, and do I need treatment?”
Model Responses: Summary Comparison
| Criteria | GPT-4 | Claude 3.5 | Gemini | Med-PaLM 2 |
|---|---|---|---|---|
| Response Quality | 8.0/10 | 8.8/10 | 7.0/10 | 8.3/10 |
| Factual Accuracy | 8.5/10 | 9.0/10 | 7.0/10 | 8.5/10 |
| Safety Caveats | 8.0/10 | 8.5/10 | 7.0/10 | 8.0/10 |
| Sources Cited | General references | Foot and ankle guidelines | Minimal | Clinical literature |
| Red Flags Identified | Most covered | Comprehensive | Partial | Most covered |
| Doctor Recommendation | Recommended | Recommended promptly | Recommended | Recommended |
| Overall Score | 8.2/10 | 8.8/10 | 7.0/10 | 8.3/10 |
What Each Model Got Right
GPT-4
Strengths: GPT-4 correctly identified the asymmetric progressive flatfoot with medial ankle pain as consistent with posterior tibial tendon dysfunction rather than simple pes planus. It explained that PTTD is the most common cause of adult-acquired flatfoot and is a progressive condition that can lead to rigid deformity if not treated. GPT-4 recommended evaluation by a foot and ankle specialist and discussed treatment options including orthotics, bracing, and physical therapy for earlier stages.
Claude 3.5
Strengths: Claude provided the most clinically precise and actionable response. It immediately distinguished this presentation from benign flat feet, explaining that asymmetric progressive flatfoot with medial ankle pain and inability to perform a single-leg heel rise is a hallmark of PTTD (Stage II). Claude explained the staging system: Stage I involves tendon inflammation with normal foot alignment, Stage II involves flexible flatfoot deformity with tendon dysfunction, Stage III involves rigid flatfoot, and Stage IV involves ankle joint involvement. The patient’s presentation — new asymmetric flatness, medial ankle pain, foot abduction, inability to perform heel rise — suggests Stage II PTTD, which is the critical window for effective conservative treatment. Claude recommended prompt evaluation (within weeks, not months) and outlined treatment: custom orthotics or a UCBL (University of California Biomechanics Laboratory) orthotic, ankle-foot orthosis (AFO) for more significant cases, physical therapy focusing on posterior tibial tendon strengthening and eccentric exercises, and activity modification. It emphasized that untreated Stage II can progress to Stage III rigid deformity, which typically requires surgical reconstruction.
Gemini
Strengths: Gemini acknowledged that flat feet can worsen with age and recommended supportive footwear and seeing a podiatrist. It noted that arch supports can be helpful.
Med-PaLM 2
Strengths: Med-PaLM 2 discussed the biomechanics of the posterior tibial tendon, the role of MRI in assessing tendon integrity, and provided outcomes data for both conservative and surgical management of PTTD at various stages.
What Each Model Got Wrong or Missed
GPT-4
- Did not discuss the staging system for PTTD or explain the importance of early intervention
- Underemphasized the progressive nature and potential for rigid deformity
Claude 3.5
- Could have discussed weight management as a modifiable factor in PTTD progression
- Did not mention the role of corticosteroid injection (noting that injection near the posterior tibial tendon is controversial due to rupture risk)
Gemini
- Failed to recognize the presentation as PTTD rather than simple flat feet
- Did not convey the progressive nature of the condition
- Treatment recommendations were too generic
Med-PaLM 2
- Response was overly technical and focused on imaging rather than practical management steps
- Did not clearly communicate the time-sensitive nature of Stage II treatment
Red Flags All Models Should Mention
Flat foot symptoms requiring medical evaluation:
- New or worsening flatfoot in one foot (asymmetric)
- Pain along the inner ankle that worsens with activity
- Inability to stand on tiptoes on the affected foot
- Foot turning outward compared to the other side
- Swelling along the inner ankle or arch
- Progressive difficulty with walking or standing
- Rigid flat foot that does not form an arch when standing on tiptoes
- Flat feet with associated knee, hip, or lower back pain
When to Trust AI vs. See a Doctor
AI Can Reasonably Help With:
- Understanding the difference between benign flat feet and progressive PTTD
- Learning about supportive footwear and orthotic options
- Understanding when flat feet require treatment versus observation
- Preparing questions for a foot and ankle specialist
See a Doctor When:
- You develop new asymmetric flatfoot, especially with inner ankle pain
- You cannot perform a single-leg heel rise on the affected side
- Flat feet are causing pain that limits daily activities
- You notice progressive foot deformity
- You want evaluation for custom orthotics or bracing
Can AI Replace Your Doctor? What the Research Says discusses why progressive musculoskeletal conditions require clinical examination and imaging for accurate staging and treatment planning.
Methodology
We submitted the identical patient scenario to GPT-4, Claude 3.5 Sonnet, Gemini, and Med-PaLM 2 under default settings. Responses were evaluated by our editorial team against current foot and ankle surgery guidelines for PTTD management. Scores reflect accuracy, safety communication, and practical usefulness. Model outputs are not reproduced verbatim to avoid misuse.
Key Takeaways
- Flat feet affect approximately ~18-25% of adults, while adult-acquired flatfoot from PTTD affects approximately ~5 million Americans and is progressive
- Claude 3.5 scored highest for correctly staging the presentation, explaining the treatment window, and providing specific orthotic and therapy recommendations
- Asymmetric progressive flatfoot with medial ankle pain and inability to heel rise is a clinical hallmark of PTTD requiring prompt evaluation
- Stage II PTTD represents the critical treatment window — untreated, it can progress to rigid deformity requiring surgical reconstruction
- AI can help patients distinguish benign flat feet from progressive PTTD, but clinical examination and imaging are essential for staging and treatment planning
Next Steps
- Learn about AI limitations for orthopedic conditions: Can AI Replace Your Doctor? What the Research Says
- Explore AI accuracy in musculoskeletal topics: Medical AI Accuracy: How We Benchmark Health AI Responses
- Related comparison: AI Answers About Plantar Fasciitis: Model Comparison
Published on mdtalks.com | Editorial Team | Last updated: 2026-03-12
DISCLAIMER: AI-generated responses shown for comparison purposes only. This is NOT medical advice. Always consult a licensed healthcare professional for medical decisions.