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Effect of methotrexate on distraction osteogenesis
D E Jarka1, R W Nicholas, J Aronson
1Children's Mercy Hospital, Kansas City, MO, USA.
Clinical Orthopaedics and Related Research
|October 2, 1998
Summary
Methotrexate did not significantly impact bone lengthening (distraction osteogenesis) in a rabbit limb reconstruction model. This study found no radiographic, histologic, or chemical differences when using the drug at clinical concentrations.
Area of Science:
- Orthopedic surgery
- Oncology
- Regenerative medicine
Background:
- Limb salvage surgery for musculoskeletal sarcomas often results in bone defects.
- Distraction osteogenesis is a technique used for bone reconstruction and limb lengthening.
- The potential impact of chemotherapy on bone healing processes requires investigation.
Purpose of the Study:
- To evaluate the effect of methotrexate on distraction osteogenesis in a rabbit tibial lengthening model.
- To determine if methotrexate, used clinically for osteosarcomas, influences bone regeneration during limb lengthening.
Main Methods:
- Eighteen rabbits underwent tibial corticotomy and external fixation for limb lengthening.
- Animals were randomized to receive either methotrexate (n=12) or placebo (n=6) during the distraction phase.
- Radiographs, serum levels, and blood counts were monitored; histologic and chemical analyses were performed post-sacrifice.
Main Results:
- Methotrexate administration did not lead to significant radiographic differences in bone lengthening.
- Histologic and chemical evaluations showed no significant impact of methotrexate on distraction osteogenesis.
- Serum methotrexate levels were comparable to those used in clinical human osteosarcoma treatment.
Conclusions:
- Methotrexate, at clinically relevant serum concentrations, does not appear to significantly inhibit distraction osteogenesis in this rabbit model.
- These findings suggest that methotrexate may not impede bone lengthening procedures in patients undergoing limb salvage for sarcomas, although further research is warranted.