Related Experiment Video
Updated: Jul 10, 2026
11:51
An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
Bisphosphonate coating on titanium screws increases mechanical fixation in rat tibia after two weeks
Karin Wermelin1, Per Aspenberg, Paula Linderbäck
1Division of Orthopaedics, Department of Neuroscience and Locomotion, Faculty of Health Sciences, Linköping University, SE-581 85 Linköping, Sweden. karwe@inr.liu.se
Journal of Biomedical Materials Research. Part A
|November 3, 2007
Summary
Bisphosphonate coatings on titanium screws significantly improve bone implant fixation. Immobilized bisphosphonates in a fibrinogen matrix enhance pullout force and energy uptake in rat tibia models.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Drug Delivery
Background:
- Immobilized N-bisphosphonate enhances screw fixation in rat tibia models.
- Titanium implants are widely used in orthopedic surgery.
- Improving implant osseointegration and mechanical stability is crucial.
Purpose of the Study:
- To compare the efficacy of bisphosphonate-coated titanium screws versus uncoated screws in a rat tibia model.
- To investigate the mechanical fixation of titanium implants using a fibrinogen matrix-bound bisphosphonate coating.
- To evaluate the release kinetics of immobilized bisphosphonates.
Main Methods:
- Titanium screws were coated with crosslinked fibrinogen, followed by immobilization of pamidronate and adsorption of ibandronate.
- Release kinetics of immobilized (14)C-alendronate were measured in buffer.
- Mechanical pullout tests were performed on implanted screws in rat tibias after 2 weeks.
Main Results:
- Bisphosphonate-coated titanium screws showed a 32% greater pullout force (p=0.04) and 48% greater energy until failure (p=0.02) compared to uncoated screws.
- Immobilized bisphosphonates within a fibrinogen matrix significantly enhanced mechanical fixation.
- Physically adsorbed pamidronate alone did not improve mechanical fixation, likely due to insufficient adsorption.
Conclusions:
- Fibrinogen matrix-bound bisphosphonates can significantly improve the mechanical fixation of titanium implants in bone.
- This approach offers a promising strategy for enhancing the stability and success of orthopedic implants.
- Further research could explore long-term effects and clinical applications.
