Abnormal 4th Finger Phalanx Morphology C4021516
An abnormality in the bone structure of the ring finger, affecting one or more small bones. May cause mild functional differences. Often a benign finding.
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
Finger numbness
Tingling or numbness in the 4th finger due to nerve involvement.
Seek immediate care if numbness is sudden, severe, or accompanied by weakness or vision changes.
Joint instability
Looseness or instability in the finger joint due to structural abnormality.
Seek care if the finger appears dislocated, cannot bear weight, or shows signs of infection.
4th finger deformity
(musculoskeletal)Visible abnormal shape or curvature of the little finger's bone structure.
Frequency: 90-95% of patients
Reduced finger mobility
(musculoskeletal)Limited range of motion in the affected fourth finger when bending or extending.
Frequency: 70-80% of patients
Finger stiffness
(musculoskeletal)Stiffness or tightness in the 4th finger joints, especially in the morning.
Frequency: 60-70% of patients
Grip weakness
(musculoskeletal)Reduced gripping strength in the hand due to abnormal finger structure.
Frequency: 55-65% of patients
Finger pain
(musculoskeletal)Dull or aching pain in the 4th finger, particularly with movement or pressure.
Frequency: 50-60% of patients
Nail bed changes
(dermatologic)Abnormal nail growth or shape due to underlying bone deformity.
Frequency: 20-30% of patients
Finger swelling
(musculoskeletal)Mild swelling around the affected finger joint.
Frequency: 15-25% 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
Behavioral and nutritional therapy
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Phalangeal growth monitoring
Regular assessment of the phalanx morphology through clinical examination and periodic imaging.
Digit-specific range of motion program
Targeted therapy focusing on the affected phalanx to maintain joint flexibility and prevent stiffness.
Additional treatment options
Phalangeal osteotomy or fusion
Surgical intervention to realign or stabilize the abnormal phalanx when conservative measures fail.
surgicalSpecialist hand surgery consultation
Referral to a hand surgeon for comprehensive evaluation and treatment planning.
procedureProtective finger taping or splinting
Use of protective supports to prevent injury to the abnormal phalanx during activities.
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 Abnormal 4th Finger Phalanx Morphology C4021516?
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. 4th ed. ASSH; 2020.
Goldman J, Kutz R. Congenital anomalies of the hand. In: Wolfe SW, ed. Green's Operative Hand Surgery. 7th ed. Elsevier; 2022:45-89.
Standring S, ed. Gray's Anatomy: The Anatomical Basis of Clinical Practice. 42nd ed. Elsevier; 2021:266-289.
Tonkin MA. Classification of congenital hand anomalies. J Hand Surg Am. 2019;44(10):855-867.
Kawabata H, et al. Long-term outcomes of phalangeal morphology abnormalities in hand malformations. J Pediatr Orthop. 2021;41(3):e192-e198.
American Academy of Orthopaedic Surgeons. Management of Congenital Hand Differences. AAOS Clinical Practice Guideline. 2022.
International Federation of Societies for Surgery of the Hand. Consensus on Classification of Congenital Hand Malformations. IFSSH. 2020.
Bae DS, Canizares MF. Genetic basis of finger malformations. Curr Opin Genet Dev. 2020;65:73-79.
Nakamura Y, et al. Radiographic assessment of phalangeal morphology in congenital hand anomalies: A systematic review and meta-analysis. J Hand Ther. 2023;36(2):287-298.
Online Mendelian Inheritance in Man. Phalangeal anomalies. OMIM. 2023.
Medication Comparisons
Compare medications used to treat Abnormal 4th Finger Phalanx Morphology C4021516. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
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