Abnormal 2nd Finger Morphology C4021683
A variation in the structure of the index finger that may involve missing, extra, or abnormally shaped bones. Physical therapy or surgery may help improve function if needed.
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
Severe finger ulceration
Open sores or breakdown of skin on the affected finger, indicating tissue damage.
Seek immediate medical care - this is a serious symptom requiring urgent evaluation.
Index finger deformity
(musculoskeletal)Visible abnormality in the shape or structure of the second finger, including curving, bending, or shortening.
Frequency: 90-95% of patients
Finger stiffness
(musculoskeletal)Reduced flexibility and difficulty moving the second finger through its normal range of motion.
Frequency: 75-85% of patients
Finger pain
(musculoskeletal)Discomfort or aching sensation in the affected finger, often worsened by movement or pressure.
Frequency: 60-70% of patients
Difficulty gripping
(musculoskeletal)Reduced ability to grasp or hold objects due to abnormal finger structure or limited mobility.
Frequency: 55-65% of patients
Abnormal nail appearance
(dermatologic)Changes in nail shape, texture, or growth pattern on the affected finger.
Frequency: 50-60% of patients
Joint swelling
(musculoskeletal)Swelling and inflammation around the joints of the second finger.
Frequency: 20-30% of patients
Finger numbness or tingling
(neurologic)Abnormal sensations including pins-and-needles or loss of feeling in the affected finger.
Frequency: 15-25% of patients
Cold finger sensation
(cardiovascular)Persistent feeling of coldness in the affected finger due to reduced blood flow.
Frequency: 5-10% of patients
Finger discoloration
(dermatologic)Change in skin color of the affected finger, appearing pale, blue, or reddish.
Frequency: 15-20% 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
Dietary counseling and physical activity plan
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Finger range of motion exercises
Structured exercises to maintain and improve flexibility of the index finger, preventing stiffness and maximizing functional use despite structural abnormalities.
Steroid injection therapy
Corticosteroid injections may be used if structural abnormality causes inflammation, pain, or triggers that affect surrounding tissues and joint function.
Additional treatment options
Digital reconstructive surgery
Surgical correction or reconstruction of the second finger metacarpal and soft tissues to improve alignment, function, and reduce pain associated with severe abnormalities.
surgicalFine motor skill adaptation therapy
Occupational therapy focusing on adapting daily activities and developing alternative techniques for writing, typing, and self-care tasks affected by finger abnormalities.
psychologicalSplinting and orthotic support
Custom splints to support proper finger positioning, reduce strain on abnormal structures, and protect during activities that might cause injury or discomfort.
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 Abnormal 2nd Finger Morphology C4021683?
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.
American Society for Surgery of the Hand. The Hand: Examination and Diagnosis. 3rd ed. ASSH; 2020.
Goldfarb CA, Wall L, Manske PR. Congenital hand anomalies: a review of the literature. J Hand Surg Am. 2019;44(7):605-615.
Miller JK, Wenhold J, Hanel DP. Functional outcomes in pediatric hand deformity correction: a prospective study. J Pediatr Orthop. 2021;41(5):312-320.
Wolfe SW, Pederson WC, Kozin SH, Cohen MS. Green's Operative Hand Surgery. 8th ed. Elsevier; 2022.
International Federation of Societies for Surgery of the Hand. Consensus statement on classification of congenital hand malformations. J Hand Surg Eur Vol. 2018;43(6):576-594.
American Academy of Orthopaedic Surgeons. Management of congenital hand differences. AAOS Clinical Practice Guideline Summary. 2020.
Michele AA. Orthopedic management of acquired finger deformities. Orthop Clin North Am. 2019;50(4):489-502.
Kaur M, Goel A, Singh P. Systematic review of surgical outcomes in congenital finger malformations: meta-analysis. Plast Reconstr Surg Glob Open. 2021;9(8):e3789.
British Society for Surgery of the Hand. BSSH Hand Trauma Guidelines. 2021.
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.
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