A 2-year RSA study of the Vanguard CR total knee system: A randomized controlled trial comparing patient-specific positioning guides with conventional technique

40 patients scheduled for total knee arthroplasty were randomized to surgery completed using either patient specific positioning guides (PSPG) or conventional instrumentation (CONV). Patients were followed for 2 years after surgery for maximum total point motion of the tibial component on radiostereometric analysis. At 2 years, only 20 patients were available for analysis. Results demonstrated, that while the difference between groups in MTPM of the tibial component was not significant, mean MTPM from 1 to 2 years increased in the PSPG group versus no marked increase noted in the CONV group.