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Systemic corticosteroids inhibit bone healing in a rabbit ulnar osteotomy model
R V Waters1, S C Gamradt, P Asnis
1Roche Bioscience, Palo Alto, CA, USA.
Acta Orthopaedica Scandinavica
|August 5, 2000
Summary
Systemic corticosteroid therapy, including prednisone, significantly impairs fracture healing. This study found prednisone-treated rabbits had poorer bone union, reduced bone density, and weaker bones compared to controls, highlighting risks for fracture repair.
Area of Science:
- Orthopedics
- Pharmacology
- Bone Biology
Background:
- Systemic corticosteroids are known to cause osteoporosis and increase fracture risk.
- The impact of these drugs on the fracture healing process remains incompletely understood.
Purpose of the Study:
- To investigate the adverse effects of systemic corticosteroid administration on fracture healing.
- To test the hypothesis that corticosteroid therapy negatively impacts bone repair using a rabbit ulnar osteotomy model.
Main Methods:
- Bilateral 1 mm ulnar osteotomies were created in 18 New Zealand White rabbits.
- Rabbits received daily subcutaneous injections of prednisone (0.15 mg/kg) or saline for 6 weeks, starting 2 months pre-operatively.
- Radiographic, DEXA, and mechanical assessments were performed to evaluate bone healing.
Main Results:
- Only 3 of 20 prednisone-treated limbs achieved radiographic union, versus 13 of 16 controls.
- Prednisone-treated rabbits showed decreased bone density and callus size.
- Mechanical testing revealed weaker osteotomies in prednisone-treated animals.
Conclusions:
- Chronic prednisone treatment significantly inhibits fracture healing in a rabbit model.
- Corticosteroid therapy adversely affects bone union, density, and mechanical strength.
- These findings suggest potential complications for fracture repair in patients on long-term corticosteroid treatment.