Rethinking Knee Fixation for Modern Patients

The landscape of total knee arthroplasty (TKA) has evolved, with today's patients being younger and heavier than those for whom current fixation methods were initially designed. India faces a significant challenge with an obesity incidence of 40.3%, driving a higher prevalence of early-onset osteoarthritis, particularly in urban populations and individuals over 40.

This demographic shift means patients require implants that can endure increased mechanical stress and last for several decades. Aseptic loosening, a common failure mechanism in cemented TKAs, is exacerbated by higher body mass index (BMI) and younger age. Data indicates a nearly doubled risk of aseptic tibial loosening in patients with a BMI of 35 or higher.

Cementless TKA offers an alternative, achieving fixation through osseointegration—the direct ingrowth of bone into the implant. While early cementless designs faced issues, contemporary implants utilize advanced technologies like 3D-printed porous structures and surface treatments to promote bone ingrowth. This approach has demonstrated strong clinical results, including high survivorship rates in younger and morbidly obese patients.

Cemented TKA remains suitable for many, especially older patients with lower functional demands. However, the growing number of younger, heavier individuals necessitates a personalized approach to fixation, with cementless options providing a robust solution for those most likely to outlive traditional fixation strategies.