Short answer · Medically reviewed summary · Last updated: 2026-04-08
Fibular hemimelia is a rare congenital limb deficiency with an estimated incidence ranging from 1 in 40,000 to 1 in 250,000 live births. While exact global prevalence is difficult to determine due to the condition's wide spectrum of severity, it is classified as a rare disease that presents at birth and is generally more common in males than in females. How common is Fibular hemimelia? Fibular hemimelia is considered a rare condition characterized by the partial or complete absence of the fibula bone.
What is the prevalence of Fibular hemimelia?
Prevalence of Fibular hemimelia: how many people are affected worldwide, differences by sex and region, with sources.
Fibular hemimelia is a rare congenital limb deficiency with an estimated incidence ranging from 1 in 40,000 to 1 in 250,000 live births. While exact global prevalence is difficult to determine due to the condition's wide spectrum of severity, it is classified as a rare disease that presents at birth and is generally more common in males than in females.
How common is Fibular hemimelia?
Fibular hemimelia is considered a rare condition characterized by the partial or complete absence of the fibula bone. Because it is a structural deficiency present from birth, its incidence is measured by the number of new cases per year rather than total population prevalence. According to data from the NIH Genetic and Rare Diseases Information Center (GARD) and other orthopedic literature, the incidence is widely cited as approximately 1 in 40,000 to 1 in 250,000 live births. At DiseaseMaps.org, we have connected with 5 members living with Fibular hemimelia, reflecting the real-world experiences of individuals navigating this rare diagnosis.
Are there demographic or gender differences in diagnosis?
Clinical studies consistently show a gender bias in the occurrence of Fibular hemimelia, with males being affected more frequently than females, often by a ratio of approximately 3:2. While the condition is congenital and identified in the pediatric population shortly after birth, there is no strong evidence suggesting specific geographic or ethnic hotspots. The rarity of the condition often makes it difficult to track large-scale epidemiological trends, as data collection is usually limited to hospital-based registries rather than population-wide screenings.
What challenges exist in calculating accurate prevalence?
Accurately calculating the prevalence of Fibular hemimelia is complicated by several factors, including:
- Spectrum of Severity: Because Fibular hemimelia ranges from mild fibular hypoplasia to total aplasia, some very mild cases may go undiagnosed or be misclassified as simple limb length discrepancies.
- Reporting Bias: Rare disease registries often capture data primarily from specialized tertiary care centers, potentially missing cases in regions with limited access to orthopedic specialists.
- Diagnostic Coding: Variations in medical coding practices across different healthcare systems can lead to inconsistencies in how these cases are reported to national databases.
These factors suggest that the true incidence may be slightly higher than the estimates currently reported in medical literature, as mild cases may not always be captured in clinical research datasets.
Is Fibular hemimelia hereditary?
Most cases of Fibular hemimelia are sporadic, meaning they occur randomly and are not inherited from parents. While researchers continue to study potential genetic factors and environmental influences during fetal development, there is no clear evidence of a familial pattern in the vast majority of patients. Families often seek genetic counseling to understand the low risk of recurrence in future pregnancies, which is generally considered very low for parents of a child with an isolated case of Fibular hemimelia.
Next steps
- Consult with a pediatric orthopedic surgeon specializing in limb reconstruction to discuss management options.
- Connect with the DiseaseMaps.org community to share experiences and find emotional support from others affected by Fibular hemimelia.
- Request a referral to a clinical geneticist if you are interested in understanding the sporadic nature of the condition and potential recurrence risks.
- Keep detailed records of diagnostic imaging and treatment plans to facilitate coordination between your multidisciplinary care team.
Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.
References
- NIH Genetic and Rare Diseases Information Center (GARD): Fibular hemimelia overview.
- Orphanet: Portal for rare diseases and orphan drugs (ORPHA:99964).
- OMIM (Online Mendelian Inheritance in Man): Entry #135700 (Fibular Aplasia).
- Journal of Pediatric Orthopaedics: Clinical reviews on congenital longitudinal limb deficiencies.
