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analytics/transcripts.jsonl

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-{"timestamp_utc": "2025-09-29T17:30:05.882108+00:00", "session_id": "c3fb217b-282e-4559-9412-f082c6baf3a0", "first_name": "shubh", "last_name": "laiwala", "question": "Compare axial rigidity (EA) vs bending rigidity (EI) for the proximal femur in QCT-based CTRA, and cite.", "answer": "Sorry — something went wrong: ValueError('cannot process flags argument with a compiled pattern')"}
+{"timestamp_utc": "2025-09-29T17:53:28.978288+00:00", "session_id": "a3274c00-35b6-4a49-a04c-ccdca3d68ea6", "first_name": "shubh", "last_name": "laiwala", "question": "Compare axial rigidity (EA) vs bending rigidity (EI) for the proximal femur in QCT-based CTRA, and cite", "answer": "and explain how they relate to the mechanical properties of bone. (Note: The study used a combination of cortical and cancellous bone.) Axial rigor (EA): Axial rigour is a measure of the resistance of a bone to compressive loading along its longitudinal axis. It is calculated as the force required to produce a given displacement of the bone segment. In this study, it was measured using CT-derivative methods, which quantified the cross-sectional area and moment of inertia of the proxi-mal femoral diaphysis. The results showed that the ovario-ectomized group had lower axial stiffness than the control group, while the partial nephre-ectomy group exhibited higher values. The correlation between CT-measured axial and mechanical axial properties was moderate (R2 = 74%). Bending rigor/stiffness (E): Bending rigour, also known as stiffness, is a property that measures the resistance to bending forces applied perpendicular to the bone's long axis. In the study, bending stiffness was derived from CT data by calculating the product of the material modulus and the second moment of area. The ovarian-ectomed group had reduced bending properties compared to controls, while partial nefrectomy resulted in increased stiffness. The relationship between CT and mechanical bending was stronger (R^2 = .85). These findings suggest that CT-estimated axial (EA), though less accurate, can provide useful information about bone strength, particularly in conditions like osteoporosis where bending stresses dominate. However, for more precise assessments, biodynamic models incorporating both EA and EI are recommended.\n\nCitations:\nStewart I et al., Reducing Variability in Murine Long Bone Mechanical Testing: A Contactless Bending Approach for Improved Reproducibility., Journal of biomechanical engineering, 2025; PMID:40847595 DOI:10.1115/1.4069500\nKhak M et al., Comparative analysis of unicortical vs. subchondral locking screws in osteoporotic proximal humerus fractures., Heliyon, 2025; PMID:39991246 DOI:10.1016/j.heliyon.2025.e42165"}