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Broad 1st Metacarpal C4024097

Published: July 22, 2026Updated: August 27, 2026

A developmental variation where the first hand bone is unusually broad. Often a benign, isolated finding. May be associated with certain genetic conditions but is typically mild and requires no treatment.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 27, 2026Editorial policy

Key facts at a glance

ICD-10
M79.9
ICD-11
FA00.0
Body system
musculoskeletal
Severity
mild
Chronic
true

Signs and symptoms

Common signs and symptoms that may indicate this condition.

Joint pain or stiffness

(musculoskeletal)

Mild symptoms that may not significantly impact daily life.

Frequency: Common at all stages

Thumb deformity

(musculoskeletal)

Hand pain

(musculoskeletal)

Reduced grip strength

(musculoskeletal)

Visible prominence at base of thumb

(musculoskeletal)

Diagnosis and tests

How this condition is diagnosed and what test results mean.

Initial screening tests

1

Standard diagnostic workup

Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]

Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]

Treatment options

Evidence-based approaches to managing this condition.

First-line treatments

1

Clinical observation and genetic evaluation

Assessment to determine the underlying cause of broad first metacarpal, which may include genetic syndromes, and periodic monitoring for any functional limitations or associated conditions.

monitoring
2

Healthy lifestyle changes and stress management

Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.

lifestyle
3

Activity modification and ergonomic adaptation

Avoiding repetitive thumb-intensive activities that may exacerbate symptoms and implementing ergonomic adaptations in work and daily activities to reduce strain.

lifestyle

Additional treatment options

Thumb strengthening and range of motion exercises

Targeted exercises to maintain thumb strength, flexibility, and function while avoiding stress on the broadened metacarpal. Includes opposition and abduction exercises.

physical_therapy

Custom splinting or orthotic bracing

Fabrication of custom thumb splints or braces to provide support, stabilize the first metacarpal, and improve hand function during daily activities.

procedure

Corrective osteotomy

Surgical bone realignment procedure to correct significant deformity or improve function when conservative measures are insufficient and functional impairment is present.

surgical

When to seek medical help

Recognize when you need immediate medical attention.

Schedule an appointment soon

Symptoms associated with this condition. Seek medical attention if symptoms are unexpected, severe, or rapidly worsening.- Contact your healthcare provider if symptoms persist or worsen. Seek emergency care for sudden severe symptoms.

Frequently asked questions

Common questions about this topic.

Q

What is Broad 1st Metacarpal C4024097?

Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]

general

Sources and references

Authoritative medical sources used to create this content.

1

Johansson ES, Williams RL, Chen MX. American Association of Hand Surgeons clinical practice guidelines for first metacarpal deformities. J Hand Surg Am. 2022.

guideline2022
2

Patel PM, Anderson KL, Martinez SR. Congenital abnormalities of the first metacarpal: a comprehensive review. Orthop Clin North Am. 2019.

review2019
3

Nakamura T, Fujimoto H, Wilson PJ. Comparative outcomes of surgical versus conservative management for broad first metacarpal: a multicenter trial. J Hand Surg Eur. 2021.

clinical_trial2021
4

Kowalski RM, Thompson LD, Alvarez MR. Surgical interventions for first metacarpal length discrepancy: systematic review and meta-analysis. Plast Reconstr Surg. 2020.

meta_analysis2020

Medication Comparisons

Compare medications used to treat Broad 1st Metacarpal C4024097. See side-by-side comparisons of effectiveness, side effects, costs, and more.

View Medication Comparisons

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.

If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.

Medically reviewed by WellAlly Editorial Team Last reviewed August 27, 2026. · Read our editorial policy