Radiological Analysis on Patients With Achondroplasia Disorder

Study Overview
=================
Brief Summary
-----------------
Achondroplasia is a genetic disorder characterized by disproportionate short stature. It affects about 1 in 2500 live births in the world. The cause of Achondroplasia was identified to be a gain-of-function mutations in the fibroblast growth receptor 3 (FGFR3). In these children compression of the spinal cord at the foramen magnum stenosis can occur in early childhood which, can lead to central sleep apnea. It can lead to morbidity and mortality. A surgical intervention may be indicated in patients who present a foramen magnum stenosis. However, surgical indications are still under discussion. The objective of this retrospective study is to analyse the degree of stenosis and its clinical tolerance/evolution from radiological data monitored at the Hospital Femme Mère Enfant.

Official Title
-----------------
Retrospective Clinical Study to Evaluate of Cranio-vertebral Abnormalities Through Radiological Analysis in Patients With Achondroplasia Treated/Followed at the Hôpital Femme Mère Enfant

Conditions
-----------------
Achondroplasia

Intervention / Treatment
-----------------
* Other: Collection of clinical data registered in Easily software


Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: Boys and girls. Aged from 0 to 18 years old. Subjects with an Achondroplasia diagnosis. Patients or parents/ legal guardian must provide non opposition prior to participation in the study. Exclusion Criteria: - Patients or patient's parents or legal guardian whose have an objection for using their data.

Ages Eligible for Study
-----------------
Maximum Age: 18 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------

Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Medical data collection<br>The medical data of patients diagnosed by Achondroplasia will be collected. The radiological data will analyse to evaluate the severity of stenosis as well as its clinical tolerance and evolution. | Other: Collection of clinical data registered in Easily software<br>* Collection of clinical data registered in Easily software<br>|

What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Evaluation of the degree of foramen magnum stenosis, its clinical tolerance and its evolution by radiological clinical data of the patients with Achondroplasia | All patients with Achondroplasia pathology followed at the Hôpital Femme Mère Enfant can be included in this study. The patients can present spinal column abnormalities such as foramen magnum stenosis. All patients diagnosed with Achondroplasia had the MRI. The MRI results will be used to evaluate the degree of deformity of stenosis and its clinical tolerance as well as its evolution. These results will help us to detect the compression at the foramen magnum to prevent lethal complications. The endpoint choice of this retrospective study will be the MRI of the first visit and the last visit. | MRI results in children with Achondroplasia will be collected through study completion an average of 2 year. | 

 Terms related to the study
=================
Keywords Provided by Centre Hospitalier Valida
-----------------
Achondroplasia, cranio-vertebral abnormalities