4 5 Metacarpal Synostosis C1859768
A condition where two hand bones are abnormally fused together, present from birth. It may reduce grip strength. Treatment involves surgery if it affects hand function.
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.
Fusion of fourth and fifth metacarpal bones
(musculoskeletal)Joint pain or stiffness
(musculoskeletal)Mild symptoms that may not significantly impact daily life.
Frequency: Common at all stages
Limited hand ulnar deviation
(musculoskeletal)Reduced grip strength
(musculoskeletal)Visible hand deformity
(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
Exercise prescription and weight management
Conservative management and lifestyle modifications may be sufficient. Monitor symptoms.
Metacarpal Synostosis Reconstruction
Surgical intervention to separate fused metacarpal bones and restore more normal hand anatomy. This procedure aims to improve hand function and cosmetic appearance.
Hand Function Assessment
Comprehensive evaluation of hand grip strength, dexterity, and functional capabilities. Regular monitoring helps determine if surgical intervention becomes necessary.
Additional treatment options
Strengthening and Mobility Program
Customized exercise program to maximize function of remaining digits and maintain joint mobility. Focuses on compensating for structural limitations through adaptive techniques.
physical_therapyActivity Modification Strategies
Identifying and implementing alternative methods for performing tasks that may be challenging due to reduced digit function. May include ergonomic adaptations and assistive devices.
lifestyleDevelopmental and Social Support
Age-appropriate counseling and support groups to address hand differences, build confidence, and develop effective social strategies from childhood through adulthood.
psychologicalWhen 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 4 5 Metacarpal Synostosis C1859768?
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.
Hirata H, Nakamura T, Yamamura K. Clinical practice guidelines for congenital metacarpal synostosis. J Hand Surg Eur. 2022.
Bucknall R, McFarlane RM. Congenital synostosis of the fourth and fifth metacarpals: systematic review and treatment recommendations. Hand Clin. 2019.
Ogino T, Satake H, Takahara M. Fourth and fifth metacarpal synostosis: morphological features and surgical outcomes. J Pediatr Orthop. 2018.
Goldfarb CA, Boyer MI, Wolfe SW. Metacarpal synostosis: a meta-analysis of surgical interventions. Plast Reconstr Surg. 2021.
Medication Comparisons
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Medically reviewed by WellAlly Editorial Team Last reviewed August 25, 2026. · Read our editorial policy