Preclinical evaluation of injectable bone substitute materials.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Preclinical Research

Background:

• Injectable bone substitutes (IBSs) offer minimally invasive bone defect repair.
• Preclinical research is essential for IBS safety and efficacy validation before clinical trials.
• Selecting the optimal animal model for IBS evaluation presents a significant challenge due to the lack of a gold standard.

Purpose of the Study:

• To propose a framework for selecting suitable preclinical models for injectable bone substitutes (IBSs).
• To review commonly used animal models for IBS evaluation in bone healing and augmentation.
• To highlight critical considerations for interpreting animal model data in the context of human clinical applications.

Main Methods:

• Literature search of scientific papers published between January 1996 and March 2012 on IBS preclinical models.
• Identification of three developmental stages (proof-of-principle, predictive validity, general scientific legitimacy) with selection criteria.
• Analysis of commonly used animal species, strains, anatomical sites, defect types, and sizes.

Main Results:

• A three-stage framework with specific criteria for selecting preclinical IBS models was identified.
• Commonly used animal models and their limitations in reflecting human bone reality were reviewed.
• Key factors influencing IBS performance in animal models, such as species, defect characteristics, and anatomical site, were discussed.

Conclusions:

• Careful selection and interpretation of animal models are vital for advancing IBS research.
• Standardized preclinical evaluation is needed to improve the translation of IBSs from bench to bedside.
• This review aims to guide researchers toward more meaningful preclinical study designs and data interpretation for IBS development.