Resultados clínicos y funcionales de la artroplastia total de rodilla Low Contact Stress (LCS®) con un mínimo de 5 años de seguimiento

Abstract

Introduction

Rotating-platform knee prosthesis were design to reduce contact stress of the implants and to increase the durability of implants.

Objective

To report the clinical outcomes of a consecutive series of patients who underwent primary rotating-platform knee arthroplasty, with a mean follow-up of 94 months.

Material and method

From 2003 to 2010, 75 total knee replacements were performed with Low Contact Stress (LCS^®) rotating-platform prosthesis. Painful knee osteoarthritis was the main diagnosis. Mean follow-up was 94 (60-118) months. Preoperatively, 64 knees had varus angulation (mean: 169°) and eleven knees had valgus angulation (mean: 187.8°). Patients were evaluated with the Hospital for Special Surgery (HSS) score at 1, 12, 36 and 60 months postoperatively.

Results

Two intraoperative partial patella tendon avulsions (2.6%) were diagnosed. Six knees showed loosening of the tibial component (8%) and four (5.3%) required revision. Two chronic infections (2.6%) were successfully managed. No polyethylene dislocation (spin-out) was observed. The mean preoperative HSS score was 44.6 points, which improved to 86.9 points at the end of the follow-up (P < 0.001).

Conclusion

Our study showed good survivorship and functional results of rotating-platform knee replacement at a mean follow-up of 94 months, similar to results of conventional fixed-bearing TKA.

Level of evidence

IV.