Osteoid in bones of elderly patients without bone disease

Area of Science:

• Gerontology
• Bone Histomorphometry
• Nephrology

Background:

• Osteoid, unmineralized bone matrix, is crucial for bone health.
• Assessing osteoid extent in elderly populations is important for understanding age-related bone changes.
• Normal ranges for osteoid in elderly individuals with normal biochemistry are not well-established.

Purpose of the Study:

• To quantitatively describe the extent of osteoid in post-mortem bone samples from elderly patients.
• To investigate the relationship between osteoid extent and biochemical parameters, specifically creatinine levels.
• To establish reference ranges for normal osteoid in elderly bone and suggest thresholds for excess osteoid.

Main Methods:

• Bone samples were obtained post-mortem from 88 elderly patients using Jamshidi needles.
• Bone biochemistry, including creatinine levels, was assessed during life.
• Quantitative analysis of relative osteoid area and trabecular osteoid surface percentage was performed.

Main Results:

• In elderly patients with normal creatinine, relative osteoid area ranged from 0-3.7% and trabecular osteoid surface percentage from 0-23%.
• Higher osteoid values were observed in patients with elevated creatinine levels.
• Osteoid extent showed no significant variation with age, sex, or time of year.

Conclusions:

• Normal ranges for osteoid in elderly individuals with normal renal function were defined.
• Elevated creatinine levels may be associated with increased osteoid deposition in bone.
• Relative osteoid area >3.5% or osteoid surfaces >25% are proposed as indicators of excess osteoid.