Testing of Novel Total Elbow Prostheses Using Active Motion Experimental Setup.

Area of Science:

• Orthopedic Surgery
• Biomechanical Engineering
• Arthroplasty Design

Background:

• Total elbow arthroplasty (TEA) aims to restore function in severe elbow joint damage.
• Current TEA designs face challenges with loosening and instability, particularly in younger, active patients.
• Novel designs focusing on inherent stability and biological fixation are needed.

Purpose of the Study:

• To evaluate the stability and fixation of a new uncemented, unconstrained total elbow arthroplasty (Kaufmann total elbow).
• To assess the performance of a ligament reconstruction-stabilized design under simulated physiological loading.

Main Methods:

• An active motion experimental setup was used to apply dynamic tendon loads to the novel total elbow arthroplasty.
• The implant underwent 25,000 flexion-extension cycles across five shoulder positions in Sawbones and cadaveric specimens.
• Angular laxity and implant stability were measured before and after cyclic loading.

Main Results:

• The uncemented Kaufmann total elbow arthroplasty demonstrated no fixation failure in any tested specimens.
• No substantial or excessive laxity was observed after 25,000 loading cycles.
• Implant stability was maintained across various shoulder positions.

Conclusions:

• The Kaufmann total elbow replacement design, utilizing intramedullary screws and ligament reconstruction, provides robust fixation and stability.
• The findings support the potential of this uncemented, non-mechanically linked arthroplasty as a viable option for elbow joint restoration.
• This design may offer a valuable solution, especially for younger patient populations requiring total elbow arthroplasty.