Thumb Hypoplasia Grade 3b C5970290
A congenital hand difference where the thumb is severely underdeveloped (a specific grade). It affects individuals with this thumb abnormality. Treatment typically involves surgical reconstruction to enhance 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 (more severe)
(musculoskeletal)Thumb instability
(musculoskeletal)Decreased pinch strength
(musculoskeletal)Interphalangeal joint stiffness
(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
Advanced thumb reconstruction
Complex reconstructive surgery tailored to severe grade 3b hypoplasia, often involving multiple staged procedures. May include bone reconstruction, soft tissue grafting, and comprehensive tendon work to create functional thumb architecture.
Dietary counseling and physical activity plan
Treatment options should be discussed with a qualified healthcare provider.
Index finger pollicization
Standard approach for severe thumb hypoplasia where the index finger is surgically converted to serve as a thumb. This procedure creates a functional tripod grip despite the absence of a native thumb.
Additional treatment options
Intensive post-surgical rehabilitation
Extended hand therapy program following surgical reconstruction to maximize functional outcomes. Focuses on strength building, coordination, and learning to use the reconstructed digit effectively.
physical_therapyLong-term functional monitoring
Ongoing evaluation of hand function, grip strength, and developmental milestones throughout childhood and adolescence. Growth monitoring to assess need for additional interventions as hand size changes.
monitoringAdaptive equipment and assistive devices
Provision of specialized tools, grips, and adaptive equipment to enhance independence in daily activities. Occupational therapists can identify appropriate devices for writing, eating, and other functional tasks.
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 Thumb Hypoplasia Grade 3b C5970290?
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.
Manske MC, Goldfarb CA. Thumb hypoplasia: strategies for treatment. J Hand Surg Am. 2022.
American Society for Surgery of the Hand. Guidelines for management of congenital thumb anomalies. J Hand Surg Am. 2021.
Hungerford SP, Chen NC, Calfee RP. Comparative outcomes of pollicization versus reconstruction in Grade 3b thumb hypoplasia. Plast Reconstr Surg. 2020.
Wollstein R, Watson HK. Congenital hand malformations. In: Green DP, ed. Operative Hand Surgery. 8th ed. Elsevier; 2022.
Medication Comparisons
Compare medications used to treat Thumb Hypoplasia Grade 3b C5970290. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
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 20, 2026. · Read our editorial policy