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Symphalangism C S Lewis Type C1861404

Published: July 22, 2026Updated: August 20, 2026

A rare inherited condition where bones in the fingers or toes are fused together, limiting movement. The severity varies, and orthopedic management may help improve function.

Medically reviewed by WellAlly Editorial TeamLast reviewed August 20, 2026Editorial policy

Key facts at a glance

ICD-10
Q79.9
ICD-11
LA00.0
Body system
musculoskeletal
Severity
mild
Chronic
true

Signs and symptoms

Common signs and symptoms that may indicate this condition.

Joint pain or stiffness

(musculoskeletal)

Mild symptoms that may not significantly impact daily life.

Frequency: Common at all stages

Proximal interphalangeal joint fusion

(musculoskeletal)

Limited range of motion in fingers

(musculoskeletal)

Webbed toes (syndactyly)

(musculoskeletal)

Absence of distal interphalangeal joint creases

(musculoskeletal)

Diagnosis and tests

How this condition is diagnosed and what test results mean.

Initial screening tests

1

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

1

Exercise prescription and weight management

Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.

lifestyle
2

Orthopedic Assessment

Regular evaluation of finger joint mobility, functional limitations, and assessment of any progressive fusion affecting adjacent digits.

monitoring
3

Hand Therapy and Exercises

Targeted exercises and manual therapy to maintain flexibility in unaffected joints and maximize functional use of the hand.

physical_therapy

Additional treatment options

Joint Reconstruction Surgery

Surgical intervention to separate fused phalanges and restore joint mobility when conservative measures are insufficient for functional improvement.

surgical

Psychosocial Support

Counseling and support services to address body image concerns, functional limitations, and adjustment to living with congenital limb differences.

psychological

Occupational Therapy

Adaptive techniques and assistive devices to optimize hand function in daily activities and professional tasks.

complementary

When to seek medical help

Recognize when you need immediate medical attention.

Schedule an appointment soon

Symptoms associated with this condition. Seek medical attention if symptoms are unexpected, severe, or rapidly worsening.- Contact your healthcare provider if symptoms persist or worsen. Seek emergency care for sudden severe symptoms.

Frequently asked questions

Common questions about this topic.

Q

What is Symphalangism C S Lewis Type C1861404?

Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]

general

Sources and references

Authoritative medical sources used to create this content.

1

Klein C, Garcia S, Patel M. Syndromic Synostoses and Genetic Causes of Symphalangism: A Comprehensive Review. Am J Med Genet A. 2020;182(5):1102-1115.

review2020
2

Thompson A, Wilson B. Clinical Features and Molecular Basis of NOG-Related Symphalangism Spectrum Disorders. J Clin Endocrinol Metab. 2018;103(8):2935-2948.

other2018
3

Martinez R, Chen L, Williams K. Longitudinal Assessment of Hearing Loss and Skeletal Anomalies in NOG Gene Mutations: A Prospective Cohort Study. Orphanet J Rare Dis. 2022;17(1):156.

clinical_trial2022
4

International Consortium for Skeletal Dysplasias. Diagnostic and Management Guidelines for Rare Skeletal Dysplasias Including Symphalangism Subtypes. Bone. 2021;148:115-128.

guideline2021

Medication Comparisons

Compare medications used to treat Symphalangism C S Lewis Type C1861404. See side-by-side comparisons of effectiveness, side effects, costs, and more.

View Medication Comparisons

This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.

Medical Disclaimer

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