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Bone mineral changes during tibial fracture healing
H C Cattermole1, J E Cook, J N Fordham
1Department of Orthopaedic Surgery, University of Bristol, Bristol Royal Infirmary, UK.
Clinical Orthopaedics and Related Research
|June 1, 1997
Summary
Dual energy x-ray absorptiometry offers a quantitative assessment of fracture healing, revealing changes in bone mineral density over time. While fracture sites may normalize, nearby bone can show persistent post-traumatic osteoporosis.
Area of Science:
- Orthopedics
- Radiology
- Bone Metabolism
Background:
- Traditional fracture healing assessment via radiographs is subjective and qualitative.
- Dual energy x-ray absorptiometry (DXA) provides precise, quantitative bone mineral density (BMD) measurements.
- BMD correlates strongly with bone's mechanical properties.
Purpose of the Study:
- To evaluate the utility of DXA in quantitatively assessing fracture healing.
- To monitor changes in BMD around tibial shaft fractures over time.
- To compare BMD in fractured bones with contralateral controls.
Main Methods:
- DXA scans were performed monthly on 14 patients with tibial shaft fractures stabilized by external fixation.
- Both fractured and contralateral (control) tibias were scanned.
- BMD changes were analyzed over the entire bone length, focusing on the fracture site and surrounding regions.
Main Results:
- DXA revealed dynamic changes in bone mineralization throughout the fractured bone.
- Fracture site BMD reached a minimum of 38% +/- 13% of contralateral values.
- Long-term alterations in BMD were observed in regions distant from the fracture, and persistent post-traumatic osteoporosis was noted proximal to the fracture site even after fracture site mineralization returned to control levels.
Conclusions:
- DXA is a valuable tool for quantitative assessment of fracture healing and monitoring bone remodeling.
- Fracture healing involves complex, long-term changes in bone mineralization extending beyond the fracture site.
- Persistent post-traumatic osteoporosis in periprosthetic regions highlights the need for further investigation and potential therapeutic strategies.