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PEDIATRICS Vol. 111 No. 3 March 2003, pp. 573-578

Intravenous Bisphosphonate Therapy in Children With Osteogenesis Imperfecta

Marni J. Falk, MD*,{ddagger}, Shauna Heeger, MS*, Katherine A. Lynch, MS*, Kathleen R. DeCaro, RN§, Deborah Bohach, OTR/L|, Karen S. Gibson, RT and Matthew L. Warman, MD*,{ddagger}

* Department of Genetics and Center for Human Genetics
{ddagger} Department of Pediatrics
§ General Clinical Research Center
|| Department of Rehabilitation
University Suburban Health Center, University Hospitals of Cleveland and Case Western Reserve University School of Medicine, Cleveland, Ohio

--> Objective. Several studies have reported beneficial effects of bisphosphonates in children with osteogenesis imperfecta (OI); however, these studies have differed in the protocols they used, and none has been independently replicated. We intended to confirm the efficacy of a specific intravenous bisphosphonate protocol in children with moderate to severe OI.

Methods. We used the protocol described by Glorieux et al and performed a prospective clinical trial in 6 children who were aged 22 months to 14 years. Each patient received intravenous pamidronate therapy for a minimum of 2 years in cycles of 1 mg/kg daily over 3 consecutive days at a mean cycle interval of 3.8 months. Outcome measures included lumbar spine areal bone mineral density (BMD) and z score, fracture rate, and occupational therapy functional assessment with serial Pediatric Evaluation of Disability Inventory.

Results. While on therapy, the average annual increase in areal BMD was 48% and the average annual increase in BMD z score was 1.0. This increase in z score is statistically significant. There was no clear correlation between changes in BMD and fracture rate. All patients experienced functional improvement in mobility.

Conclusions. Our results support the findings of Glorieux et al that cyclic administration of intravenous pamidronate in children with OI has beneficial effects with respect to BMD z scores and physical disability. Long-term follow-up will be required to determine whether bisphosphonate therapy will decrease fracture rates and increase mobility in children with moderate to severe OI.

Key Words: osteogenesis imperfecta • bisphosphonate • pamidronate • bone density

Abbreviations: OI, osteogenesis imperfecta • BMD, bone mineral density • PEDI, Pediatric Evaluation of Disability Inventory

Received for publication Feb 4, 2002; Accepted Jul 23, 2002.




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