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analytics/transcripts.jsonl

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 {"timestamp_utc": "2025-09-29T16:36:53.461087+00:00", "session_id": "c64c4414-9ce3-4a6b-9498-3fa6c0085542", "first_name": "Shubh", "last_name": "Laiwala", "question": "Compare how axial rigidity (EA) and bending rigidity (EI) are computed in CTRA for the proximal femur, and explain why EI often governs failure risk — and cite.", "answer": "Axial rigority (EA): EA is calculated by dividing the moment of inertia of the cross-sectional area of the cortex by the length of the bone segment. It is a measure of the resistance of the structure to bending forces. Bending rigoridity (GJ): GJ is calculated as the product of the moment arm and the modulus of elasticity of the material. It measures the ability of the segment to resist bending deformation. Given that the moment arms of the protruding cortical bone are larger than those of the cancellous bone, the GJ of the entire femur is dominated by the cortical moment arm. Therefore, the EI of the whole femur will be governed by the EA of the neck and shaft, which are predominantly cortical. In the case of a long bone like the femoral diaphysis, the moment-of-inertia is dominated at the cortices, and the E modulus is dominated in the cortice, so the Gj is dominated. Thus, the bending stiffness of the diaphyseal cortex is the primary determinant of the overall bending strength of the long bone. Citations: Stewart 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 Khak 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"}
+{"timestamp_utc": "2025-09-29T16:37:05.902303+00:00", "session_id": "c64c4414-9ce3-4a6b-9498-3fa6c0085542", "first_name": "Shubh", "last_name": "Laiwala", "question": "Give a step-by-step QCT workflow to estimate torsional rigidity (GJ) at the femoral neck", "answer": "From QCT, torsional rigidity is estimated as GJ, where J ≈ Σ(dAᵢ·rᵢ²) about the slice centroid and G = E/(2(1+ν)) from the voxel E map (ν≈0.3). Compute per-slice and report the minimum."}