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Bone loss following tibial osteotomy: a model for evaluating post-traumatic osteopenia
M K Karlsson1, P O Josefsson, A Nordkvist
1Department of Orthopaedics, Malmö University Hospital, Sweden.
Summary
Bone mineral density (BMD) loss after knee surgery can be significant and region-specific, with incomplete recovery within 15 months. This suggests post-fracture bone loss may follow, not precede, the injury.
Area of Science:
- Orthopedics
- Bone Metabolism
- Radiology
Background:
- Reduced bone mineral density (BMD) is often observed in patients with fractures.
- The timing of this bone loss—whether it precedes or follows the fracture—remains a key question in understanding bone fragility.
Purpose of the Study:
- To investigate the magnitude and reversibility of bone loss in the 15 months following osteotomy in patients with knee arthritis.
- To determine if reduced BMD is a cause or consequence of fracture-related bone fragility.
Main Methods:
- Dual-energy X-ray absorptiometry (DXA) was used to measure BMD in 26 patients (21 men, 5 women) after knee osteotomy.
- BMD changes were tracked in the affected tibia, total body, spine, and contralateral proximal femur over 15 months.
Main Results:
- A maximum BMD decrease of 35% was observed in the mid-diaphysis of the affected tibia at 9 months post-surgery (p < 0.001).
- Bone loss was region-specific, with significant deficits also noted in the total body (5%), spine (15%), and contralateral proximal femur (10%) at 9 months (p < 0.01).
- Bone loss reversal was incomplete by 15 months, with a remaining deficit of 20% in non-fractured bones (p < 0.001).
Conclusions:
- Post-traumatic bone loss is a localized phenomenon with incomplete reversibility within 15 months.
- Reduced BMD in fracture patients may be a consequence of the injury or related surgical intervention, rather than solely a predisposing factor.