Histology USMLE Step 1 Practice Question
A 72-year-old woman with osteoporosis (bone mineral density T-score −2.8) falls and sustains a femoral neck fracture. Intraoperatively, vital signs are stable (BP 138/82, HR 88, RR 16, SpO2 98%). Histologic sections from the fracture callus reveal disorganized collagen fibers and irregularly arranged osteocytes embedded in osteoid matrix. No evidence of mineralization is present. Which of the following best describes this immature repair tissue?
Answer choices
- AElastic cartilage
- BCompact lamellar bone
- CReticular bone marrow
- DFibrocartilage
- EWoven boneCorrect answer
- FHyaline cartilage
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