Abby Niesen

UC Davis

“Tibial Baseplate Migration After Kinematically Aligned Total Knee Replacement”

Because 1 million Americans require knee replacement every year and because about 1 in 4 people are not satisfied with their artificial knee using conventional surgical techniques, Abby is researching an alternative personalized surgical technique. In particular, the long-term safety of this personalized technique is unknown, so Abby is assessing this risk by measuring the implant movement over time.


Currently, 20-25% of patients are dissatisfied after total knee replacement (TKR) due to pain and/or poor function, necessitating improvements to the traditional TKR surgical technique. Kinematically aligned (KA) TKR is an alternative patient-specific technique and several studies reported that patients treated with KA TKR have significantly better pain relief, function, and a more normal feeling knee than patients treated with traditional techniques. However, there is concern that the tibial baseplate (the implant fixed to the shin bone) might experience early loosening. Long-term baseplate loosening can be predicted using baseplate migration (movement of the baseplate relative to the shin bone) via stability limits (maximum migration). This ongoing longitudinal study will measure baseplate migration over 2 years in 70 patients. Results at 1 year have demonstrated low mean baseplate migration below the established stability limit. These findings help allay the concern that KA TKR compromises tibial baseplate stability.

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