Related Experiment Video
Updated: Jul 15, 2026
07:13
Two Techniques to Create Hypoparathyroid Mice: Parathyroidectomy Using GFP Glands and Diphtheria-Toxin-Mediated Parathyroid Ablation
Published on: March 14, 2017
Preserved three-dimensional cancellous bone structure in mild primary hyperparathyroidism
D W Dempster1, R Müller, H Zhou
1Regional Bone Center, Helen Hayes Hospital, West Haverstraw, New York 10993, USA. dempster@helenhayeshosp.org
Bone
|May 11, 2007
Summary
Mild primary hyperparathyroidism (PHPT) preserves cancellous bone structure. Advanced 3D analysis using microcomputed tomography (microCT) confirms bone microarchitecture remains intact in PHPT patients.
Area of Science:
- Bone biology and endocrinology
- Skeletal microarchitecture analysis
- Osteoporosis research
Background:
- Conventional 2D histomorphometry previously suggested preserved cancellous bone in mild primary hyperparathyroidism (PHPT).
- Further investigation using advanced 3D analysis was warranted to confirm these findings.
- Understanding bone changes in PHPT is crucial for managing metabolic bone diseases.
Purpose of the Study:
- To evaluate cancellous bone microarchitecture in mild PHPT using 3D microcomputed tomography (microCT).
- To compare bone structural variables between PHPT patients and healthy controls.
- To investigate the influence of age and sex on bone structure in PHPT.
Main Methods:
- Iliac crest bone biopsies were analyzed from postmenopausal women, premenopausal women, and men with PHPT, alongside age- and sex-matched controls.
- 3D microcomputed tomography (microCT) was employed for detailed histomorphometric analysis.
- Key parameters analyzed included bone volume/total volume (BV/TV), bone surface/total volume (BS/TV), connectivity density (Conn.D), and trabecular separation (Tb.Sp).
Main Results:
- Postmenopausal women with PHPT showed smaller age-related declines in bone volume (BV/TV) and connectivity density (Conn.D) compared to controls.
- In PHPT, cancellous bone volume (BV/TV), bone surface/total volume (BS/TV), and connectivity density (Conn.D) were higher, with lower trabecular separation (Tb.Sp).
- No significant differences in 3D indices were observed between men and women with PHPT, and age was not correlated with structural variables in PHPT women.
Conclusions:
- Three-dimensional cancellous bone microarchitecture is preserved in patients with mild primary hyperparathyroidism.
- MicroCT analysis provides a more comprehensive understanding of bone structure in PHPT than 2D methods.
- These findings suggest that mild PHPT may not significantly impair cancellous bone quality at the microarchitectural level.
Related Concept Videos
00:59The Parathyroid Glands
The two pairs of parathyroid glands embedded within the posterior surface of the thyroid gland are restricted by a dense capsule around them. These glands comprise two distinct cell populations—parathyroid oxyphil and parathyroid principal cells- pivotal in calcium homeostasis.
Oxyphil cells, whose functions remain elusive, emerge during late puberty, adding a layer of complexity to the parathyroid gland's intricacies. In contrast, principal parathyroid cells undertake a vital role by producing...
Oxyphil cells, whose functions remain elusive, emerge during late puberty, adding a layer of complexity to the parathyroid gland's intricacies. In contrast, principal parathyroid cells undertake a vital role by producing...
01:40Bone Remodeling
Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
01:09Spongy Bone
All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...
01:17Hormones and Bone Tissue
The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
01:55Bone Structure
Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
01:18The Bone Matrix
Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in acid or...