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Physical therapy management of infants and children with hypophosphatasia
Dawn Phillips1, Laura E Case2, Donna Griffin3
1University of North Carolina, Division of Physical Therapy, Department of Allied Health Sciences, 1104 Willow Drive, Chapel Hill, NC 27517, USA.
Insights
Hypophosphatasia (HPP) is a rare metabolic bone disease. Physical therapy is crucial for managing musculoskeletal issues and improving function in children with HPP, especially alongside enzyme replacement therapy.
Area of Science:
- Metabolic bone diseases
- Genetics and rare diseases
- Physical therapy and rehabilitation
Background:
- Hypophosphatasia (HPP) is a rare inherited metabolic disorder causing defective bone mineralization.
- Clinical manifestations range from perinatal lethality to milder skeletal abnormalities and muscle weakness.
- Enzyme replacement therapy shows promise, but the role of physical therapy is often overlooked.
Purpose of the Study:
- To highlight the underrecognized role of physical therapy in managing Hypophosphatasia.
- To emphasize the importance of understanding HPP's natural history for effective intervention.
- To guide physical therapists in optimizing functional outcomes for affected children.
Main Methods:
- Review of HPP natural history and disease characteristics.
- Analysis of potential impacts of medical interventions on functional limitations.
- Emphasis on individualized and setting-specific physical therapy approaches.
Main Results:
- Physical therapy can significantly improve musculoskeletal function and daily living activities in HPP patients.
- Tailored interventions considering disease severity, medical fragility, and environment are key.
- Parental and caregiver education is vital for consistent therapy and improved development.
Conclusions:
- Physical therapy is an essential component of comprehensive HPP management.
- Understanding disease progression and response to treatment allows for optimized physical therapy interventions.
- Individualized, multidisciplinary care, including physical therapy, enhances functional independence and development in children with HPP.
Abstract:
Hypophosphatasia (HPP) is a rare inborn error of metabolism resulting in undermineralization of bone and subsequent skeletal abnormalities. The natural history of HPP is characterized by rickets and osteomalacia, increased propensity for bone fracture, early loss of teeth in childhood, and muscle weakness. There is a wide heterogeneity in disease presentation, and the functional impact of the disease can vary from perinatal death to gait abnormalities. Recent clinical trials of enzyme replacement therapy have begun to offer an opportunity for improvement in survival and function. The role of physical therapy in the treatment of the underlying musculoskeletal dysfunction in HPP is underrecognized. It is important for physical therapists to understand the disease characteristics of the natural history of a rare disease like HPP and how the impairment and activity limitations may change in response to medical interventions. An understanding of when and how to intervene is also important in order to optimally impact body function, lessen structural impairment, and facilitate increased functional independence in mobility and activities of daily living. Individualizing treatment to the child's needs, medical fragility, and setting (home/school/hospital), while educating parents, caregivers, and school staff regarding approved activities and therapy frequency, may improve function and development in children with HPP.
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