Thumb Hypoplasia Grade 4 C5970291
Grade 4 thumb hypoplasia is a severe congenital condition where the thumb is significantly underdeveloped or absent. Surgical reconstruction and rehabilitation help improve hand function.
Key facts at a glance
- ICD-10
- M79.9
- ICD-11
- FA00.0
- Body system
- musculoskeletal
- Severity
- severe
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Joint pain or stiffness
(musculoskeletal)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Severe thumb hypoplasia
(musculoskeletal)Limited thumb mobility
(musculoskeletal)Reduced grip strength
(musculoskeletal)Thumb instability
(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
Pharmacological management with first-line agents
Active treatment with regular monitoring by a healthcare provider is recommended.
Thumb Reconstruction Surgery
Surgical reconstruction of the hypoplastic thumb using techniques such as web space deepening, ligament reconstruction, and tendon transfers to improve function and appearance. The procedure aims to create a functional pinch mechanism.
Hand Therapy Program
Specialized occupational therapy focusing on strengthening the reconstructed thumb, improving dexterity, and retraining fine motor skills. Therapy progresses through staged exercises to restore functional use.
Additional treatment options
Custom Splinting
Fabrication of a custom orthotic to support thumb positioning, protect surgical repairs during healing, and maintain optimal alignment during the recovery phase.
procedureSerial Radiographic Assessment
Regular X-ray imaging to evaluate bone development, carpometacarpal joint stability, and growth patterns in the affected thumb to guide long-term treatment decisions.
monitoringAdaptive Techniques Training
Training in adaptive strategies and assistive devices to maximize hand function in daily activities. Includes recommendations for modified tools and ergonomic adaptations.
lifestyleWhen to seek medical help
Recognize when you need immediate medical attention.
See a doctor within 24 hours
Moderate to severe symptoms that may indicate worsening of this condition. Prompt medical evaluation is recommended.
Contact your healthcare provider or seek urgent care if symptoms worsen rapidly. Go to the emergency department for life-threatening symptoms.
Frequently asked questions
Common questions about this topic.
What is Thumb Hypoplasia Grade 4 C5970291?
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, Calfee RP. Thumb hypoplasia: classification and treatment algorithms. Hand Clin. 2019.
Goldfarb CA, Boyer MI, Drolet BA. ASSH congenital hand malformation guidelines. J Hand Surg Am. 2020.
Kozin SH, Zlotolow DA. Pediatric hand and upper extremity surgery. In: Thumb Reconstruction Chapter. Elsevier; 2021.
Wall LB, Roberts S, Bauer AS. Pollicization outcomes in severe thumb hypoplasia. Plast Reconstr Surg. 2022.
Medication Comparisons
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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.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy