A new technique for determining proper mechanical axis alignment during total knee arthroplasty: progress toward...

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Medical Imaging

Background:

• Accurate prosthetic component placement is crucial for successful total knee arthroplasty (TKA) to restore lower extremity mechanical alignment.
• Existing methods may involve invasive procedures or extensive preparation, impacting efficiency and patient comfort.

Observation:

• A novel noninvasive technique utilizing the Optotrack system to determine the femoral head center is presented.
• Direct digitization of knee and ankle bony landmarks intraoperatively aids in achieving proper lower extremity alignment.
• The system allows real-time monitoring of movement, rotation, and displacement during surgery.

Findings:

• The technique accurately locates the femoral head within 2-4 mm, achieving better than 1-degree angular accuracy.
• Cadaver studies confirmed the accuracy and reproducibility of the femoral head localization method.
• This approach eliminates the need for computed tomography scans or preliminary marker placement.

Implications:

• This computer-assisted TKA method offers a more precise and reproducible approach to achieving neutral mechanical axis alignment.
• The noninvasive nature and reduced preparation time can lead to improved surgical efficiency and patient experience.
• This technique holds potential for advancing computer-assisted orthopedic surgery and enhancing TKA outcomes.