Abnormal 1st Metacarpal Morphology C4024114
A structural variation in the thumb bone that may affect grip strength or thumb movement. Severity varies, and orthopedic interventions can help when function is impaired.
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.
Thumb deformity
(musculoskeletal)Visible abnormal shape or appearance of the thumb due to changes in the first metacarpal bone structure.
Frequency: 90-100% of patients
Thumb shortening
(musculoskeletal)Noticeably shorter thumb compared to normal anatomical proportions due to metacarpal shortening.
Frequency: 85-95% of patients
Thumb curvature
(musculoskeletal)Abnormal angulation or bending of the thumb, often presenting as clinodactyly or lateral deviation.
Frequency: 60-70% of patients
Limited thumb mobility
(musculoskeletal)Reduced range of motion in the thumb joint, particularly affecting flexion and extension movements.
Frequency: 50-60% of patients
Thumb base pain
(musculoskeletal)Discomfort or aching sensation at the base of the thumb near the first metacarpal joint.
Frequency: 40-50% of patients
Weak grip strength
(musculoskeletal)Decreased ability to firmly grasp objects due to thumb structural abnormality affecting hand function.
Frequency: 35-45% of patients
Joint instability
(musculoskeletal)Looseness or wobbling of the thumb joint due to abnormal metacarpal development affecting ligament support.
Frequency: 15-25% of patients
Fine motor difficulty
(neurologic)Challenges performing precise hand movements such as writing, buttoning, or picking up small objects.
Frequency: 20-30% of patients
Fatigue with hand use
(constitutional)Quick tiring of the thumb and hand during activities requiring sustained grip or repetitive motion.
Frequency: 10-20% of patients
Cosmetic concern
(dermatologic)Awareness or dissatisfaction with the appearance of the thumb due to abnormal morphology.
Frequency: 40-50% of patients
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
Hand and wrist rehabilitation
Targeted exercises to improve thumb mobility, strength, and function. Therapy focuses on compensating for structural abnormalities while maximizing use of the affected digit.
Healthy lifestyle changes and stress management
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Orthopedic follow-up
Regular assessment by orthopedic specialists to monitor growth and development, particularly important in children where the metacarpal abnormality may affect hand function as they grow.
Additional treatment options
Metacarpal reconstructive surgery
Surgical intervention to correct severe structural abnormalities, realign the bone, or reconstruct the first metacarpal for improved hand function and appearance.
surgicalBody image and coping support
Psychological counseling to address concerns about hand appearance and function, particularly beneficial for adolescents and adults dealing with cosmetic concerns.
psychologicalAssistive device provision
Custom orthotics and adaptive equipment to enhance hand function for daily activities. Includes specialized grips, writing aids, and tools designed for thumb-limited function.
complementaryWhen 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 Abnormal 1st Metacarpal Morphology C4024114?
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.
Kumar P, Kusuma A. Thumb Anomalies. StatPearls. Treasure Island (FL): StatPearls Publishing; 2024.
Goldfarb CA, Wall L, Manske PR. Radial longitudinal deficiency: the current state of knowledge. J Hand Surg Am. 2014;39(9):1864-1872.
Standring S. Gray's Anatomy: The Anatomical Basis of Clinical Practice. 42nd ed. Elsevier; 2021.
Fischer J, Sood R, Hamamy H, et al. Genetic basis of congenital hand malformations: a review. Clin Genet. 2022;101(2):157-169.
American Society of Hand Therapists. Clinical Assessment Recommendations for Hand and Wrist Anomalies. ASHT; 2020.
Tonkin MA, Tolerton SK, Quick T, et al. Classification of thumb anomalies: a review. J Hand Surg Eur Vol. 2013;38(2):165-177.
Giele H, Giele C. The incidence and epidemiology of congenital hand anomalies: a systematic review. Hand (N Y). 2022;17(4):595-606.
Manske PR, Goldfarb CA. Congenital failure of formation of the upper limb. Hand Clin. 2009;25(2):157-170.
Wolfe SW, Pederson WC, Hotchkiss RN, Kozin SH, Cohen MS. Green's Operative Hand Surgery. 8th ed. Elsevier; 2022.
Bamshad M, Watkins WS, Dixon ME, et al. The genetics of limb malformations: models and mechanisms. Hum Mol Genet. 2021;30(R1):R40-R53.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy