Radiostereometric measurement of implant migration in robotically assisted vs conventional bi-cruciate stabilized cemented total knee arthroplasty: secondary analysis of a randomized controlled trial.

研究概要

Fifty-one patients with osteoarthritis were randomized to receive robotically assisted (n=26) or conventional (n=25) cemented bi-cruciate stabilized total knee arthroplasty. The primary outcome was maximum total point motion (MTPM) of the tibial component at 1 and 2 years, measured via radiostereometric analysis. Secondary outcomes included tibial rotations (x-, y-, z-axes), subsidence, and lift-off. Follow-up assessments were performed at 3, 12, and 24 months. Overall, the robotic group demonstrated higher MTPM at both 12 months and 24 months, as well as greater flexion/extension rotation at 24 months. Migration between 12–24 months did not differ significantly between groups. These findings suggest robotic assistance resulted in greater early migration, though all values remained within accepted safe thresholds.