Triphalangeal Thumb Type I Cn259068
A congenital hand difference where the thumb has an extra bone, affecting hand function. It occurs during fetal development and may be managed with therapy or surgery if needed.
Key facts at a glance
- ICD-10
- Q89.9
- ICD-11
- LA00.0
- Body system
- congenital
- Severity
- mild
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Generalized symptoms
(congenital)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
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
Exercise prescription and weight management
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Thumb reconstruction surgery
Surgical reconstruction of the triphalangeal thumb to create a more normal appearance and improve function. Surgery typically involves removing the extra phalanx and stabilizing the joint.
Hand therapy program
Structured physical and occupational therapy to improve thumb strength, range of motion, and fine motor skills. Essential both before and after any surgical intervention.
Additional treatment options
Developmental assessment
Regular assessment of hand function and thumb development by pediatric orthopedic specialists to determine optimal timing for any interventions.
monitoringSplinting and orthotic support
Temporary splinting may be used to support thumb position, improve alignment awareness, and protect the thumb during activities. Custom splints are often needed.
procedurePsychological support and counseling
Support for patients and families dealing with the cosmetic appearance of thumb differences. Addresses body image concerns and promotes positive adaptation.
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 Triphalangeal Thumb Type I Cn259068?
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.
Goldberg MJ, Bae DS. Practice guidelines for management of congenital thumb anomalies. J Pediatr Orthop. 2022.
Tonkin MA, Tolerton SK, Quick TJ. Triphalangeal thumb: clinical features and surgical management. Hand Clin. 2021.
Liu H, Wang Q, Chen J. Surgical outcomes and functional analysis of triphalangeal thumb reconstruction: a retrospective cohort study. J Hand Surg Eur Vol. 2020.
McCarroll HR, Manske PR. Congenital hand malformations: genetic and developmental considerations. Orthop Clin North Am. 2019.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 20, 2026. · Read our editorial policy