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Updated: Jan 28, 2026

A Mouse Distraction Osteogenesis Model
Published on: November 14, 2018
Reverse Distraction for Treatment of Hydrocephalic Macrocephaly in Late Childhood
Hannah Miller1,2, Paul Grabb1,2, Michael Lypka1,2
1Division of Pediatric Plastic and Craniofacial Surgery and Division of Neurosurgery, Children's Mercy Hospital, Kansas City, MO.
Insights
Reverse distraction osteogenesis offers a safer method for cranial reduction in children with severe macrocephaly. This technique improved a young patient's head control and social interaction, showing promise for older children.
Area of Science:
- Pediatric Neurosurgery
- Craniofacial Surgery
- Medical Technology
Background:
- Macrocephaly significantly impacts children's quality of life, affecting mobility and social interaction.
- Traditional cranial reduction methods carry high risks, including bleeding and shunt complications.
- Severe macrocephaly, often linked to conditions like holoprosencephaly and hydrocephalus, requires effective treatment.
Purpose of the Study:
- To evaluate the efficacy and safety of reverse distraction osteogenesis for cranial reduction in a pediatric patient with severe macrocephaly.
- To present the case of the oldest patient with macrocephaly treated using this technique.
Main Methods:
- A 9-year-old girl with holoprosencephaly and severe macrocephaly underwent cranial reduction using reverse distraction osteogenesis.
- The procedure involved circumferential craniotomy, placement of cranial distractors, followed by distractor removal and cranioplasty with resorbable fixation.
Main Results:
- The patient experienced significant postoperative improvements in head control and engagement in school activities.
- This represents the oldest reported case of macrocephaly treated with reverse distraction osteogenesis.
Conclusions:
- Reverse distraction osteogenesis provides a safe and effective method for cranial reduction in children with profound macrocephaly.
- The technique's gradual cranial vault contraction and limited initial bony surgery enhance safety, making it suitable for older children.
Abstract:
Macrocephaly diminishes quality of life for children whose head size inhibits independent mobility and appropriate interaction with caregivers. Cranial reduction is a method of addressing these issues, historically with a high morbidity due most commonly to bleeding and shunt complications. The authors present a 9-year-old girl with holoprosencephaly and severe macrocephaly from progressive hydrocephalus who underwent cranial reduction via reverse distraction osteogenesis, a method to slowly reduce the skull volume. The patient underwent circumferential occipital temporoparietal frontal craniotomy with placement of 4 cranial distractors, followed approximately 1 month later by removal of the distractors and cranioplasty with resorbable fixation devices. The patient demonstrated significant postoperative improvement in head control and interaction in school activities. This is the oldest patient with macrocephaly treated with reverse distraction in the literature to date. The slow contraction of the cranial vault with limited bony surgery at the time of initial reduction provides an additional safety margin, and should be considered in older children presenting with profound macrocephaly.
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