Experimental bone biopsies using two bone biopsy needles: quantitative micro-CT analysis of bone specimens.

Area of Science:

• Bone research
• Medical imaging
• Osteoporosis diagnostics

Background:

• Accurate quantitative evaluation of metabolic bone disease is crucial for diagnosis and treatment.
• Micro-computed tomography (micro-CT) enables detailed 3D analysis of bone microarchitecture.
• Assessing the adequacy of small biopsy samples is essential for reliable micro-CT analysis.

Purpose of the Study:

• To determine if bone samples from 2.4-mm and 1.8-mm trephines are sufficient for quantitative analysis of metabolic bone disease using micro-CT.
• To compare the accuracy of quantitative parameters derived from different trephine sizes against baseline vertebral data.

Main Methods:

• 19 porcine lumbar vertebrae underwent micro-CT imaging before and after biopsy with 2.4-mm and 1.8-mm trephines.
• Seven 3D structural parameters (trabecular bone volume, number, thickness, separation, structure model index, degree of anisotropy, bone pattern factor) were measured using CtAn software.
• Paired t tests and Bland-Altman analysis assessed differences and agreement between biopsy samples and baseline specimens.

Main Results:

• The 2.4-mm trephine samples showed no significant differences from baseline for trabecular bone volume, thickness, and number.
• The 1.8-mm trephine samples showed no significant difference from baseline only for trabecular thickness.
• Significant differences were observed for other parameters when using the 1.8-mm trephine compared to baseline.

Conclusions:

• Bone samples obtained with a 2.4-mm trephine are acceptable for quantitative evaluation of trabecular bone volume, thickness, and number.
• The 2.4-mm trephine is superior to the 1.8-mm trephine for quantitative analysis of bone structure using micro-CT.
• These findings support the use of 2.4-mm trephine biopsies for reliable metabolic bone disease assessment.