Vibration transmission in bone-anchored prosthesis under vertical load. Cadaver study

Area of Science:

• Biomechanics
• Rehabilitation Engineering
• Biomedical Signal Processing

Background:

• Sensory feedback from devices enhances user control and training.
• Rehabilitation device vibrations serve as sensory feedback to improve outcomes.
• Osseoperception is crucial for effective prosthetic device control.

Purpose of the Study:

• To investigate vibration transmissibility in bone-anchored prostheses under varying axial loads.
• To understand the relationship between axial compression, frequency response, and vibration attenuation in prosthetic samples.

Main Methods:

• Tested five above-knee prosthesis, implant, and cadaver bone samples under axial compression.
• Generated vibrations using a shaker to simulate external forces.
• Measured oscillations with a laser vibrometer to analyze frequency responses and vibration attenuation.

Main Results:

• Increased axial loading raised resonance frequency and decreased vibratory displacement.
• At low frequencies (40-80 Hz), higher axial load reduced vibration transmissibility.
• Transmissibility showed unstable changes at medium and high frequencies with increasing axial load.

Conclusions:

• Prosthesis vibration analysis by users explains the osseoperception phenomenon.
• Vibration transmissibility is influenced by axial compression and excitation frequency.
• Reduced vibration amplitude with increased axial load is key to diminished vibration perception.