[Survival after aseptic loosening of GENESIS II (Smith & Nephew) primary knee prosthesis in patients with medium and long-term follow-up].

INTRODUCTION

medium- and long-term follow-up after total knee replacement (TKR) is essential to establish patient expectations and evaluate implant survival. This study focused on analyzing the survival of the GENESIS II system in primary knee prostheses due to aseptic loosening, with a follow-up of up to 20 years.

MATERIAL AND

METHODS

a retrospective study was conducted on 520 patients who underwent 683 TKR procedures using the GENESIS II system between 2003 and 2018. Of these cases, 31% were bilateral TKR, and 69% were unilateral, with a predominance of the right side. The average follow-up period was 11 years, reaching up to 20 years. Demographic, clinical, and surgical data were collected and analyzed using Student's t-tests, 2 tests, and Kaplan-Meier survival curves. Reoperation was considered only if the complete implant was replaced.

RESULTS

the average patient age was 66.8 years (range: 37-90 years), with females accounting for 57% of cases. Obesity was present in 43% of the patients, and 18% had comorbidities such as diabetes mellitus. The 20-year implant survival rate was 97% (CI: 93-100%). The revision rate was 1%, while overall complications reached 6%, including superficial infections (2%), traumatic injuries (2%), arthrofibrosis (< 1%), and deep infections (0.57%).

CONCLUSION

the GENESIS II system demonstrated a high survival rate due to aseptic loosening in medium- and long-term follow-up (100%), with an all-cause survival rate of 97%, minimal revision rates, and low complication rates. This establishes it as a reliable option for total knee arthroplasty.