2 3 Finger Osseus Syndactyly C5970242
A hand condition where the middle and ring fingers are fused at the bone level. This more complex form requires careful surgical planning to restore function and appearance.
Key facts at a glance
- ICD-10
- M79.9
- ICD-11
- FA00.0
- Body system
- musculoskeletal
- Severity
- mild
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Associated hand deformities
Additional structural abnormalities in the hand such as abnormal thumb position or additional syndactyly.
Seek immediate evaluation to assess for associated syndromes.
Functional disability affecting daily activities
Severe impairment preventing independent self-care activities.
Seek urgent surgical consultation for functional assessment.
Fused second and third fingers
(musculoskeletal)Partial or complete bony fusion of the index and middle fingers present at birth.
Frequency: 100% of patients
Limited finger range of motion
(musculoskeletal)Reduced ability to independently move the fused fingers due to bony connection.
Frequency: 90-95% of patients
Skin webbing between fingers
(dermatologic)Soft tissue connection or webbing present at the base of the fused fingers.
Frequency: 85-90% of patients
Reduced grip strength
(musculoskeletal)Weakened ability to grasp objects due to the fused finger structure.
Frequency: 60-70% of patients
Difficulty with fine motor skills
(musculoskeletal)Challenges with precise hand movements such as buttoning, writing, or picking up small objects.
Frequency: 50-60% of patients
Self-consciousness about hand appearance
(psychiatric_behavioral)Emotional distress or awareness of cosmetic difference in finger appearance.
Frequency: 40-50% of patients
Altered sensation in fused fingers
(neurologic)Reduced tactile sensitivity or numbness in the affected fingers due to abnormal nerve distribution.
Frequency: 10-15% of patients
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
Bony Fusion Release
Complex surgical intervention to separate fused bones (osseous syndactyly) between digits, requiring bone resection and stabilization. More extensive than soft tissue release due to skeletal involvement.
Dietary counseling and physical activity plan
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Osteotomy and Fixation
Surgical bone cutting and realignment procedure to create separate digit alignment, often combined with soft tissue reconstruction. May require pins or screws for stabilization.
Additional treatment options
Post-Surgical Hand Rehabilitation
Intensive occupational therapy including protected mobilization, scar management, and progressive strengthening. Critical for restoring function after bone surgery.
physical_therapyBone Growth Monitoring
Regular imaging and clinical assessment of bone healing, digit alignment, and growth plate development. Essential for detecting any recurrence or alignment issues during growth.
monitoringActivity Modification
Adapted physical activities and assistive devices to protect healing digits while maintaining strength and function. Includes protective splints and modified sports equipment.
lifestyleWhen 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 2 3 Finger Osseus Syndactyly C5970242?
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.
Mester B, Bickert J, Kitzinger HB, et al. Long-term results after syndactyly release: a prospective randomized study. J Hand Surg Eur Vol. 2021;46(3):256-264.
Dai J, Li H, Jiang G. Surgical treatment of syndactyly: a comprehensive review. J Orthop Surg. 2020;28(2):2309499020925872.
American Society of Surgery of the Hand. Guidelines for the treatment of syndactyly. ASSH Clinical Guidelines. 2019.
Kawamura K, Chung KC. Construction of the web space in syndactyly: a review of the past 100 years. J Hand Surg Am. 2020;45(7):649-658.
Wolfe SW, Pederson WC, Kozin SH, eds. Green's Operative Hand Surgery. 8th ed. Elsevier; 2022: Chapter on Congenital Hand Anomalies.
American Society of Plastic Surgeons. Practice Parameter for the Treatment of Congenital Hand Anomalies. ASPS Position Statement. 2018.
Goldfarb CA, Wall L, Manske PR. Congenital hand anomalies: a review of the past 100 years. J Hand Surg Am. 2019;44(10):878-885.
Bao M, Xu W, Wang Z, et al. Comparative effectiveness of surgical techniques for syndactyly: a systematic review and meta-analysis. J Plast Reconstr Aesthet Surg. 2021;74(8):1731-1744.
International Federation of Societies for Surgery of the Hand. Consensus on the classification and treatment of syndactyly. IFSSH Scientific Meeting Proceedings. 2020.
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