Continuous migration of components noted between 12 & 24 months with PSI in total knee arthroplasty .
A 2-year RSA study of the Vanguard CR total knee system: A randomized controlled trial comparing patient-specific positioning guides with conventional technique
Acta Orthop. 2018 Aug;89(4):418-424. doi: 10.1080/17453674.2018.147086640 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.
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