Related Experiment Videos
Inflammatory cell changes in haversian canals. A possible cause of osteoporosis in rheumatoid arthritis
T Takashima1, K Kawai, K Hirohata
1Kobe University School of Medicine, Japan.
Insights
Rheumatoid arthritis patients show larger haversian canals with more osteoclasts in femoral bone. These morphological changes may explain significant cortical bone loss in rheumatoid arthritis.
Area of Science:
- Orthopedics
- Rheumatology
- Bone Biology
Background:
- Osteopenia is a common condition characterized by reduced bone mass.
- Rheumatoid arthritis (RA) is an inflammatory disease that can lead to secondary osteopenia.
- Haversian canals are microscopic structures within cortical bone crucial for bone remodeling.
Purpose of the Study:
- To investigate the morphological differences of haversian canals in osteopenic cortical bone.
- To compare bone morphology in patients with rheumatoid arthritis, osteoarthritis, and coxa valga.
Main Methods:
- Microscopic examination of medial femoral neck cortical bone samples.
- Morphometric analysis of haversian canal diameters and cellular content.
- Comparison of findings across patient groups: rheumatoid arthritis, osteoarthritis, and coxa valga.
Main Results:
- Haversian canals were larger in rheumatoid arthritis bone compared to osteoarthritis and coxa valga.
- Increased presence of osteoclasts within haversian canals was observed in rheumatoid arthritis.
- Rheumatoid arthritis bone showed more vascular infiltration and inflammation within haversian canals.
Conclusions:
- Distinct morphological alterations in haversian canals are associated with rheumatoid arthritis.
- These changes, including increased osteoclast activity and inflammation, likely contribute to accelerated cortical bone loss in RA.
- Understanding these mechanisms can inform therapeutic strategies for bone loss in inflammatory conditions.
Abstract:
We studied the morphology of the haversian canals in the osteopenic cortical bone of the medial femoral neck from patients with rheumatoid arthritis and compared the findings with those in patients with osteoarthritis and with uncomplicated coxa valga. In the rheumatoid bone, the diameters of the canals were larger and many more contained osteoclasts. Fewer haversian canals showed only lining cells than in the osteoarthritic or coxa valga patients. In bone from rheumatoid patients, especially in canals with osteoclasts, small blood vessels were frequently lined by tall endothelial cells with an infiltration of mononuclear cells. These morphological differences are discussed with reference to the possible mechanisms of loss of cortical bone in rheumatoid arthritis and other conditions.