Primary hyperparathyroidism: iliac crest cortical thickness, structure, and remodeling evaluated by histomorphometric...

Area of Science:

• Bone biology
• Endocrinology
• Skeletal physiology

Background:

• Primary hyperparathyroidism (PHP) is a common endocrine disorder.
• Bone involvement in PHP is characterized by increased bone resorption.
• The precise effects of PHP on bone remodeling dynamics remain incompletely understood.

Purpose of the Study:

• To investigate static and dynamic bone parameters in patients with primary hyperparathyroidism.
• To compare bone remodeling in PHP patients with age- and sex-matched controls.
• To assess the influence of age and sex on bone structure in PHP.

Main Methods:

• Iliac crest bone biopsies were analyzed from 62 PHP patients and 30 healthy controls.
• Static parameters (cortical width, porosity) and dynamic parameters (bone formation rate, mineral appositional rate) were measured.
• Tetracycline labeling was used to evaluate bone formation and remodeling activity.

Main Results:

• PHP patients showed increased endocortical eroded and formative surfaces and higher endocortical bone formation rates.
• Cortical porosity was significantly increased in PHP patients compared to controls.
• No significant differences in cortical width were observed, but age-related decreases in relative cortical width were noted in women.

Conclusions:

• Primary hyperparathyroidism is associated with increased endocortical bone turnover and porosity.
• Bone remodeling alterations in PHP are surface-specific and influenced by sex and age.
• These findings contribute to understanding the skeletal manifestations of PHP.