Thumb Hypoplasia Grade 3a C5970289
A congenital hand difference where the thumb is significantly underdeveloped (more severe grade). It affects people born with this abnormality. Surgical reconstruction or rehabilitation is often needed to improve hand function.
Key facts at a glance
- ICD-10
- M79.9
- ICD-11
- FA00.0
- Body system
- musculoskeletal
- Severity
- moderate
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Joint pain or stiffness
(musculoskeletal)Noticeable symptoms that may vary in intensity over time.
Frequency: Common at all stages
Thumb hypoplasia
(musculoskeletal)Limited thumb range of motion
(musculoskeletal)Reduced grip strength
(musculoskeletal)Associated hand anomalies (thenar muscle hypoplasia)
(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
Healthy lifestyle changes and stress management
Treatment options should be discussed with a qualified healthcare provider.
Thumb reconstruction surgery
Surgical intervention to reconstruct or improve thumb function using various techniques including web space deepening, ligament reconstruction, and tendon transfers. The specific procedure depends on anatomical findings and functional goals.
Hand therapy and rehabilitation
Specialized occupational therapy focusing on grip strength, fine motor skills, and functional hand use. Therapy includes targeted exercises, splinting when needed, and desensitization techniques.
Additional treatment options
Pollicization procedure
For severe grade 3a cases, this procedure involves surgically transforming the index finger into a functional thumb, creating a new opposable digit for improved hand function and grip capability.
procedureSerial hand assessments
Regular orthopedic and developmental assessments to monitor hand growth, function progression, and determine optimal timing for surgical intervention if needed. Imaging studies may be used periodically.
monitoringPsychological support and body image counseling
Counseling services to address potential self-esteem concerns, social challenges, and adjustment issues related to hand appearance and function. Age-appropriate support helps children develop positive body image.
psychologicalWhen 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 Thumb Hypoplasia Grade 3a C5970289?
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.
Tonkin MA, Boyce DE, Fleming PP, et al. The association of dupuytren's contracture with thumb hypoplasia: clinical practice guidelines. J Hand Surg Eur. 2019.
Manske PR, Goldfarb CA. Thumb hypoplasia: a clinical review and classification system. Hand Clin. 2020.
Gouzou S, Matzaroglou C, Karargyris O, et al. Functional outcomes after pollicization for thumb hypoplasia grade 3a: a retrospective study. J Reconstr Microsurg. 2021.
Lightdale-Miric N, Ritz M, Thompson B, et al. Reconstruction of the hypoplastic thumb: techniques and outcomes. Orthop Clin North Am. 2022.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy