A new device for performing reference point indentation without a reference probe.

Area of Science:

• Biomedical Engineering
• Orthopedics
• Materials Science

Background:

• Assessing bone material properties is crucial for diagnosing and managing skeletal diseases.
• Existing reference point indentation (RPI) instruments often require invasive procedures or complex setups, limiting clinical applicability.

Purpose of the Study:

• To introduce a novel, handheld reference point indentation (RPI) instrument for non-invasive clinical measurement of bone material properties in living patients.
• To detail guidelines for optimizing the use of this new RPI instrument for accurate and reproducible results.

Main Methods:

• Development of a novel, handheld RPI instrument that eliminates the need for a reference probe or periosteal removal.
• Establishment of five key guidelines for instrument operation: angle of incidence (<10°), spring compression rate (>1 s), probe tip sharpness (<10 μm, with calibration for duller tips), ambient temperature (4-37°C), and specimen mass (>1 kg or anchored).

Main Results:

• The described RPI instrument significantly simplifies patient testing compared to previous devices.
• Adherence to the five guidelines ensures accurate and reproducible bone material property measurements.
• Training for the instrument takes approximately 5 minutes.

Conclusions:

• The portable, user-friendly RPI instrument with minimal training requirements is suitable for clinical settings.
• This device facilitates in-vivo assessment of bone material properties, potentially improving patient diagnosis and treatment.
• The simplified methodology broadens the accessibility of RPI for clinical research and practice.