Histology · Year 1 · from Histology
Case 3: Osteoporosis with Vertebral Compression Fracture
Clinical Image
Source: Radiopaedia - Osteoporosis - CC BY-NC-SA 3.0
Case Presentation
A 72-year-old postmenopausal woman presents with sudden-onset mid-back pain that began while lifting groceries. She denies trauma. She is thin, has smoked for 40 years, and has not taken hormone replacement therapy. Physical examination reveals point tenderness over T11-T12 with kyphosis. Spinal X-rays reveal a wedge compression fracture of T12 with decreased vertebral body height anteriorly. Incidentally noted is generalized osteopenia and multiple prior vertebral compression deformities. DEXA scan reveals a T-score of -3.2 at the lumbar spine (normal > -1.0; osteoporosis < -2.5). Laboratory studies including calcium, vitamin D, and thyroid function are normal. She is diagnosed with osteoporosis with pathologic fracture. Treatment includes pain management, a thoracolumbar brace, calcium and vitamin D supplementation, and bisphosphonate therapy to reduce bone resorption. She is counseled on fall prevention and smoking cessation.
Key Learning Points
- Osteoporosis is characterized by reduced bone mass and deterioration of bone microarchitecture, increasing fracture risk
- The condition results from an imbalance where osteoclast-mediated bone resorption exceeds osteoblast-mediated bone formation
- Trabecular (spongy) bone is affected earlier and more severely than cortical bone due to its higher surface area and metabolic activity
- Risk factors include estrogen deficiency (postmenopausal), advanced age, smoking, low body weight, and physical inactivity
- Common fracture sites include vertebral bodies, femoral neck, and distal radius - all areas rich in trabecular bone
Summary: Specialized Connective Tissue Disorders
These cases demonstrate pathology of specialized connective tissues:
| Disorder | Tissue Affected | Pathophysiology | Key Histological/Radiological Finding |
|---|---|---|---|
| Osteoarthritis | Articular (hyaline) cartilage | Mechanical wear, limited repair capacity | Cartilage fibrillation, chondrocyte clusters, joint space narrowing |
| Achondroplasia | Epiphyseal plate cartilage | FGFR3 overactivity inhibits chondrocyte proliferation | Shortened proliferative zone, disorganized growth plate |
| Osteoporosis | Bone (especially trabecular) | Resorption exceeds formation | Thin trabeculae, reduced bone mass, compression fractures |
Understanding the normal structure and function of cartilage and bone is essential for recognizing and managing these common conditions.