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Related Experiment Videos

Bone measurements in asymptomatic primary hyperparathyroidism

S Adami1, V Braga, R Squaranti

  • 1Cattedra di Reumatologia, COC di Valeggio, Verona, Italy.

Bone
|May 26, 1998
PubMed
Summary

Asymptomatic primary hyperparathyroidism (PHPT) causes significant cortical bone loss in postmenopausal women due to increased endosteal resorption and periosteal apposition. This bone loss, particularly in cortical bone, impacts bone density measurements and structural integrity.

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Area of Science:

  • Endocrinology
  • Bone Biology
  • Radiology

Background:

  • Asymptomatic primary hyperparathyroidism (PHPT) is associated with bone involvement, predominantly affecting cortical bone.
  • The clinical significance and pathophysiologic basis of this preferential cortical bone loss remain unclear.

Purpose of the Study:

  • To investigate the effects of PHPT on cortical bone in postmenopausal women.
  • To determine the relationship between PHPT and bone mineral density (BMD) and bone structure.

Main Methods:

  • Dual-energy X-ray absorptiometry (DXA) was used to measure BMD at various skeletal sites in 77 postmenopausal women with PHPT.
  • Radiogrammetry of the second metacarpus was performed on hand X-rays to assess cortical area per total area (CA/TA) and bending breaking resistance index (BBRI).

Related Experiment Videos

  • Longitudinal changes in bone structure were analyzed in a subset of patients and controls over 5-12 years.

    • Main Results:

    • Patients with PHPT showed significantly lower CA/TA z scores, indicating cortical thinning due to enlarged inner diameter.
    • DXA revealed significantly lower BMD z scores at the lumbar spine, ultradistal radius, proximal radius, and Ward's triangle in PHPT patients.
    • Longitudinal analysis demonstrated significantly greater endosteal resorption and periosteal apposition per decade in PHPT patients compared to controls, with endosteal resorption being predominant.

    Conclusions:

    • PHPT is characterized by augmented endosteal bone resorption and periosteal apposition, leading to preferential cortical bone loss and diminished cortical thickness.
    • The enlargement of long bones in PHPT may lead to an underestimation of areal BMD.
    • While structural changes may partially compensate for bone loss, the increased porosity and thinning of cortical bone are significant findings in PHPT.