Micro-morphologic changes around biophysically-stimulated titanium implants in ovariectomized rats

Area of Science:

• Biomaterials Science
• Orthopedics
• Regenerative Medicine

Background:

• Osteoporosis impairs bone remodeling, potentially compromising osseointegration of titanium implants.
• Understanding bone micro-architecture changes around implants in osteoporotic models is crucial for improving treatment outcomes.

Purpose of the Study:

• To investigate the effects of pulsed electromagnetic field (PEMF) and mechanical vibration (MECHVIB) on bone regeneration around titanium implants in an osteoporotic rat model.
• To evaluate micro-morphological changes in peri-implant bone subjected to biophysical stimulation.

Main Methods:

• Ovariectomy was performed in rats to induce osteoporosis, followed by bilateral tibial implantation of titanium fixtures.
• Animals were divided into control, PEMF, and MECHVIB groups, receiving specific biophysical stimulation protocols for two weeks.
• Micro-computed tomography (microCT) was used to analyze relative bone volume and micro-structural parameters in the peri-implant region.

Main Results:

• Both PEMF and MECHVIB significantly increased relative bone volume in the peri-implant area compared to the control group (P < .05).
• Trabecular number around implants was significantly higher in both stimulation groups versus control (P < .05).
• No significant differences were observed in trabecular thickness or separation among the groups (P > .05).

Conclusions:

• Biophysical stimulation effectively enhances bone volume and quality around titanium implants in osteoporotic bone.
• Low-magnitude, high-frequency mechanical vibration demonstrated superior efficacy over PEMF in improving relative bone volume for osseointegration.