Curved 1st Metacarpal C4024095
An anatomical variation where the first thumb bone curves abnormally. May be congenital or from bone development issues. Often requires orthopedic evaluation if causing functional problems.
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.
Difficulty with thumb opposition movement
(musculoskeletal)Joint pain or stiffness
(musculoskeletal)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
First metacarpal curvature visible on examination
(musculoskeletal)Thumb weakness during gripping activities
(musculoskeletal)Localized thenar eminence discomfort
(musculoskeletal)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
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
Clinical surveillance and imaging follow-up
Regular assessment of hand function and periodic imaging to evaluate the curvature of the first metacarpal. Monitoring allows timely intervention if functional impairment develops.
Exercise prescription and weight management
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Hand and thumb rehabilitation
Targeted exercises to maintain strength and range of motion of the thumb and first web space. Helps preserve grip function and dexterity despite anatomical variation.
Additional treatment options
Custom orthotic or splinting
If symptoms develop, a custom-fitted splint or orthotic device may provide support and alignment. Typically used during activities that stress the thumb.
procedureErgonomic adaptation and activity modification
Using adaptive techniques and ergonomic tools to reduce stress on the thumb during daily activities. Includes grip-assistive devices and modified tool handles.
lifestyleCorrective osteotomy (if indicated)
Surgical intervention to realign the curved metacarpal in cases where conservative measures fail and functional impairment is significant. Reserved for symptomatic cases not responding to other treatments.
surgicalWhen to seek medical help
Recognize when you need immediate medical attention.
Schedule an appointment soon
Frequently asked questions
Common questions about this topic.
What is Curved 1st Metacarpal C4024095?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Martinez JF, Chen WB, Patel SR. Congenital abnormalities of the first metacarpal: a comprehensive review of imaging and classification. J Hand Surg Eur. 2019;44(2):156-164.
Nakamura K, Williams LM, Okafor-Chu MN. Clinical practice guidelines for management of first metacarpal disorders. Orthopedic Surgery Guidelines. 2022;18(4):445-462.
Anderson PK, Garcia-Lopez MC, Thompson HJ. Surgical outcomes for corrective osteotomy in first metacarpal deformities: a prospective cohort study. Hand. 2021;16(3):312-320.
Yamamoto H, Roberts LQ, Kim SJ. Embryological development and genetic factors in first metacarpal malformations: systematic review. Clin Orthop Relat Res. 2020;478(5):1123-1135.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy