Mobility in osteogenesis imperfecta: a multicenter North American study.

Area of Science:

• Orthopedics
• Genetics
• Rehabilitation Medicine

Background:

• Osteogenesis imperfecta (OI) is a genetic disorder characterized by bone fragility.
• Phenotypic severity in OI directly influences ambulation, yet mobility characteristics, particularly in severe forms, remain understudied.

Purpose of the Study:

• To characterize mobility in individuals with Osteogenesis imperfecta (OI) using established clinical assessments.
• To identify patient-specific characteristics that can predict mobility outcomes in OI.

Main Methods:

• Analysis of mobility data from the largest cohort of OI patients (n=491) across five clinical sites.
• Utilized linear mixed models to investigate correlations between subject demographics and mobility metrics.

Main Results:

• Mild OI cases exhibited minor mobility limitations, whereas severe OI types demonstrated significant impairments across all assessed mobility metrics.
• Patient height and weight emerged as the most influential predictors of mobility.
• The relationship between bisphosphonate use and mobility varied based on OI type and administration route (oral/intravenous).

Conclusions:

• Findings enhance understanding of mobility deficits specific to OI types, informing the development of targeted rehabilitation protocols.
• Emphasizes the importance of disease classification and severity assessment for predicting mobility prognosis in OI patients, benefiting clinicians, patients, and caregivers.