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Bone density in osteogenesis imperfecta may well be normal

C R Paterson1, P A Mole

  • 1Department of Biochemical Medicine, University of Dundee, Ninewells Hospital and Medical School, UK.

Postgraduate Medical Journal
|February 1, 1994
PubMed
Summary
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Osteopenia has a differential diagnosis.

Scottish medical journal·2002

Osteogenesis imperfecta (OI) diagnosis requires careful evaluation, as normal bone density or cortical thickness on routine radiographs does not exclude the condition, especially in types I and IV.

Area of Science:

  • Medical Genetics
  • Orthopedics
  • Endocrinology

Background:

  • Osteogenesis imperfecta (OI) is often misclassified as osteoporosis.
  • Bone fragility in OI stems from defective collagen, not solely reduced bone mass.
  • Cortical thickness is typically normal in unfractured bones of OI patients.

Purpose of the Study:

  • To assess bone mineral content in adult patients with characterized Osteogenesis Imperfecta (OI).
  • To evaluate the diagnostic utility of bone densitometry in distinguishing OI types I, III, and IV.
  • To highlight diagnostic challenges in OI types I and IV without family history.

Main Methods:

  • Bone mineral content of the distal forearm was measured in 61 adult OI patients.
  • Patients were categorized into OI types I, III, and IV.

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  • Statistical analysis compared patient bone mass to reference intervals.

    • Main Results:

    • Type III patients showed significantly low bone mass.
    • Type I and IV patients exhibited bone mass significantly lower than normal (P < 0.001).
    • A notable 70% of patients had bone mass values within the normal reference interval, indicating normal densitometry does not rule out OI.

    Conclusions:

    • Normal bone densitometry or cortical thickness on routine radiographs cannot exclude Osteogenesis Imperfecta.
    • Diagnosis of OI, particularly types I and IV, requires consideration beyond standard bone density measurements.
    • Accurate OI diagnosis may necessitate advanced genetic or specialized imaging assessments, especially when family history is absent.