Achondroplasia, Hypochondroplasia
Conditions
Brief summary
The study aims to identify which Syde®-derived digital outcomes are reliable in FGFR3-related Skeletal Dysplasia. This requires to set-up a natural history study to measure limb movements in patients with ACH or HCH.
Interventions
None listed
Sponsors
SYSNAV
Study design
Observational model
COHORT
Time perspective
PROSPECTIVE
Eligibility
Sex/Gender
ALL
Age
3 Years to 65 Years
Healthy volunteers
No
Inclusion criteria
1. Aged 3 years old or older at the time of consent. 2. Written informed consent obtained: 1. From the parent(s) or legal guardian(s) for participants under 18 years old. 2. From participants 18 years old and older. 3. Affiliated to, or beneficiary of a social security category 4. Able to walk unassisted for at least 10 meters. 5. Genetically confirmed diagnosis with one pathogenic variant (ACMG class IV \& V) of achondroplasia or hypochondroplasia. 6. Participant (and caregivers for participants under 18 years old) willing and able to comply with all study procedures including: questionnaires, Syde® related procedures
Exclusion criteria
1. Subjects who have short stature condition other than ACH/HCH. 2. Presence of cognitive disorders that limit their understanding of the data collection process (training of device use and 4-week recording periods every 6 months, device return at the end of the study), the implication of the study and consent. 3. Presence or history of any concurrent disease or condition that could interfere with study participation, impact pediatric growth, affect motor or balance or gait function (such as neurological, endocrine, infectious, allergic, osteoarthritis, or inflammatory), assessed by the investigator. 4. Females who are pregnant, or planning to become pregnant during the study duration. 5. Body Mass Index = 35 kg/m2. 6. Recent upper and/or lower limbs injury (trauma/fracture or surgery) in the 6 months preceding inclusion. 7. Prior limb lengthening surgery or planned or expected to have limb lengthening surgery while enrolled in the study. 8. Presence of guided growth hardware (such as 8-plates) or planned orthopedic surgeries during the study. 9. Vulnerable patient (guardianship, curatorship or safeguarding of justice), unable to provide informed consent or who is unable to express their consent.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Reliability of digital endpoint derived from Syde® assessed by the Intra-Class Correlation (ICC) for each recording period timepoint. | 12 months | reliability assessed by the ICC (Intra-Class Correlation)for each recording period timepoint (baseline, 6 months, 12 months) |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| number of participants reaching 180 hours of recording during the recording periods defined in the protocol | 12 months | Number of patients reaching 180 hours of recordings during the recording periods defined in the protocol (supposed optimal threshold for Syde®-derived digital endpoint computation) at baseline, 6 months, 12 months |
| French System Usability Score (F-SUS) score at 6 months of Syde® use | 6 months | French System Usability Score (F-SUS) at 6 months. The System Usability Scale is a 10-item questionnaire . It is a simple tool to measure the usability of an interactive system and it is widely used. For each item, the user is asked to express their level of agreement or disagreement from 1 (strongly disagree) and 5 (strongly agree). |
| Correlation between digital endpoints derived from Syde® and 6-minutes walk test (6MWT) | 12 months | Correlation at baseline and at different timepoints between Syde® derived digital endpoint and 6MWT |
| Correlation between digital endpoints derived from Syde® and growth parameters | 12 months | Correlation at baseline and at different timepoints between Syde® derived digital endpoints and annualized growth velocity, height Z-score, body proportion ratios |
| Correlation between digital endpoints derived from Syde® and Patient-reported Outcomes (PROs) | 12 months | Correlation at baseline and at different timepoints between Syde® derived digital endpoints and PROs |
| Longitudinal Change in digital endpoints derived from Syde® | 12 months | Change from baseline in digital endpoints derived from Syde® at 6 and 12 months |
| Syde® movement reconstruction accuracy compared to Optical Motion Capture measures. | Baseline | Stride detection accuracy of Syde®, stride length and stride velocity accuracy of Syde® and upper limb measures, compared to Optical Motion Capture measures |
| Qualitative interview exploring limitations on mobility and impact on daily life | baseline | caregiver and/or participant qualitative interview exploring limitations on mobility daily life |
Countries
France
Contacts
CONTACTFerial Toumi
PRINCIPAL_INVESTIGATORGenevieve Baujat
Hopital Necker
Outcome results
None listed