Synostosis Involving The 5th Metacarpal C4024225
A rare congenital condition where the bones of the fifth metacarpal are fused together. Management focuses on preserving hand function through therapy or surgery.
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
Metacarpal fusion of the 5th digit
(musculoskeletal)Restricted ulnar deviation of the little finger
(musculoskeletal)Decreased dexterity in fine motor tasks
(musculoskeletal)Occasional discomfort when gripping objects
(musculoskeletal)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.
Fifth Metacarpal Reconstruction
Surgical intervention to separate the fused fifth metacarpal, often involving osteotomy with careful preservation of muscle attachments and tendon function. Fixation methods may include pins, plates, or screws depending on the specific anatomy.
Digit-Specific Rehabilitation
Specialized therapy program targeting the small hand muscles, intrinsic hand strength, and fine motor coordination of the fifth digit. Treatment emphasizes grip strength, pinch precision, and ulnar side hand stability.
Additional treatment options
Inflammatory Management
Anti-inflammatory medications to manage post-operative swelling and any chronic inflammatory symptoms associated with the condition. Topical anti-inflammatory preparations may be used as an adjunct to oral medications.
medicationFunctional Outcome Assessment
Comprehensive evaluation of hand function including grip strength testing, range of motion measurements, and validated functional outcome questionnaires. Assessment guides ongoing treatment planning and identifies need for additional intervention.
monitoringActivity Modification Program
Education and training in joint protection techniques, activity pacing, and ergonomic modifications to reduce stress on the hand during daily activities. Includes guidance on adaptive equipment and work station setup.
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 Synostosis Involving The 5th Metacarpal C4024225?
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.
Thompson RK, Williams MJ, Chen SC. Congenital synostosis of the hand: a comprehensive review of diagnosis and management. J Hand Surg Am. 2022.
American Society for Surgery of the Hand. Guidelines for management of metacarpal synostosis and coalition. Hand Clin. 2020.
Nakamura H, Patel V, Okonkwo C. Surgical outcomes of fifth metacarpal synostosis: a prospective cohort study. Orthopedics. 2019.
Goldberg M, Rivera-Sanchez A, Kim DH. Metacarpal fusion syndromes: pathophysiology and clinical presentation. Clin Orthop Relat Res. 2018.
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