High-Flexion Total Knee Arthroplasty Using NexGen LPS-Flex System: Minimum 5-year Follow-up Results

Area of Science:

• Orthopedic Surgery
• Biomedical Engineering
• Knee Arthroplasty Research

Background:

• Total knee arthroplasty (TKA) aims to restore function and alleviate pain in patients with knee osteoarthritis.
• High-flexion TKA designs are developed to improve range of motion and patient satisfaction.
• Assessing long-term outcomes and implant survivorship is crucial for evaluating TKA effectiveness.

Purpose of the Study:

• To evaluate the clinical and radiological results of high-flexion TKA using the NexGen LPS-flex system.
• To determine the implant survivorship of the NexGen LPS-flex system at a minimum 5-year follow-up.

Main Methods:

• Retrospective review of 80 patients (118 knees) who underwent patellar preserving TKA with the NexGen LPS-flex implant.
• Assessment of range of motion (ROM), hip-knee-ankle angle, Knee Society Knee Score (KSKS), and Knee Society Function Score (KSFS) preoperatively and postoperatively.
• Comparison of femoral and tibial component positions on immediate postoperative and long-term follow-up X-rays.

Main Results:

• Significant improvements in mean ROM (110.2° to 132.4°), KSKS (36.9 to 94.2), and KSFS (30.5 to 93.7) were observed.
• No significant changes in implant position were detected between immediate postoperative and long-term follow-up.
• Implant survivorship was high at 99.2% at 5 years, with only one revision due to aseptic loosening.

Conclusions:

• The NexGen LPS-Flex implant design provides satisfactory clinical and radiological outcomes for high-flexion TKA.
• The implant demonstrates a high survival rate of 99.2% after 5 years for activities of daily living.
• This study supports the use of this high-flexion TKA system for improved patient function and longevity.