Evaluation of a high density polyethylene fixing system for hydroxyapatite ceramic implants.

Area of Science:

• Biomaterials Engineering
• Orthopedic Surgery
• Medical Device Technology

Background:

• Artificial hydroxyapatite (HAP) implants require robust fixation systems for successful clinical integration.
• The mini ROC fastener system offers a potential solution for securing HAP implants to various tissues.

Purpose of the Study:

• To evaluate the fixing ability of the mini ROC fastener system for porous HAP implants.
• To determine optimal parameters (drill hole diameter and depth) for the mini ROC system.
• To assess the efficacy of combining the mini ROC system with drill-free screws.

Main Methods:

• Pull-out tests were conducted to measure the fixation strength of the mini ROC system.
• Preliminary studies identified optimal drill hole dimensions (2.10 mm diameter, 6 mm depth).
• Comparative analysis of mini ROC system alone versus combined with drill-free screws.

Main Results:

• Optimal conditions yielded a pull-out strength exceeding 7 kgf for the mini ROC system.
• Combining the mini ROC system with drill-free screws achieved superior fixation strength (approx. 10 kgf).
• The system demonstrated suitability for soft tissue attachment (muscle, tendon, periosteum) and plate fixation.

Conclusions:

• The mini ROC fastener system exhibits adequate clinical fixing ability for HAP implants.
• Enhanced fixation is achieved when used with drill-free screws, broadening its application range.
• This effective fixation method is expected to promote wider clinical adoption of artificial HAP implants.