A Mechatronic Loading Device to Stimulate Bone Growth via a Human Knee

Area of Science:

• Biomedical Engineering
• Orthopedics
• Rehabilitation Technology

Background:

• Dynamic mechanical loading is a promising modality for bone repair and rehabilitation.
• Existing research in animal and mechanical studies informs the development of new therapeutic devices.
• Ailments like fractures, osteoporosis, and osteoarthritis affect long bones, necessitating effective treatment strategies.

Purpose of the Study:

• To design and develop an innovative device for applying controlled dynamic mechanical load to human knee joints.
• To validate the device's functionality and structural integrity through simulation and experimental testing.
• To prepare the device for clinical studies investigating its efficacy in treating bone-related ailments.

Main Methods:

• Design of a dynamic mechanical loading device utilizing a modified slider-crank linkage mechanism.
• Actuation by a brushless Direct Current (DC) motor for uniform and cyclic force application.
• Simulation of device functionality and finite element analysis for structural integrity.
• Microcontroller-based programming for precise control of force, frequency, and duration.
• Experimental testing for usability and functional validation.

Main Results:

• The device successfully applies dynamic mechanical load to human knee joints.
• Simulations and finite element analysis confirmed the structural integrity for prototype construction.
• Experimental results demonstrated that the device meets requirements for force magnitude and operational frequency.
• The device exhibited usability and full functionality in various tests.

Conclusions:

• The designed device effectively applies controlled dynamic mechanical load to knee joints.
• The device is validated and ready for clinical studies to assess its therapeutic potential.
• Controlled knee-loading may offer a new regimen for treating fractures, osteoporosis, and osteoarthritis.